- Abronia - Arboreal Alligator Lizards
- Abronia bogerti - Bogert's Arboreal Alligator Lizard
- Abronia chiszari - Chiszar's Arboreal Alligator Lizard
- Abronia deppei - Deppe's Arboreal Alligator Lizard
- Abronia fuscolabialis - Mount Zempoaltepec Alligator Lizard
- Abronia graminea - Sierra De Tehuacan Arboreal Alligator Lizard
- Abronia leurolepis - Flat-scaled Arboreal Alligator Lizard
- Abronia lythrochila - Red-lipped Arboreal Alligator Lizard
- Abronia martindelcampoi - Martin Del Campos Arboreal Alligator Lizard
- Abronia matudai - Matuda's Arboreal Alligator Lizard
- Abronia mitchelli - Mitchell's Arboreal Alligator Lizard
- Abronia mixteca - Mixtecan Arboreal Alligator Lizard
- Abronia oaxacae - Oaxacan Arboreal Alligator Lizard
- Abronia ochoterenai - Ochoterena's Arboreal Alligator Lizard
- Abronia ornelasi - Ornelas's Arboreal Alligator Lizard
- Abronia ramirezi - Ramirez Arboreal Alligator Lizard
- Abronia reidi - Reid's Arboreal Alligator Lizard
- Abronia smithi - Smith's Arboreal Alligator Lizard
- Abronia taeniata - Banded Arboreal Alligator Lizard
- Agama - Agamas
- Agama agama - African Rainbow Lizard
- A. a. africana - West African Rainbow Lizard
- Agama agama - African Rainbow Lizard
- Ameiva - Ameivas
- Ameiva ameiva - Giant Ameiva
- Ameiva chaitzami - Chaitzam's Ameiva
- Ameiva festiva - Middle American Ameiva
- A. f. edwardsii - Edward's Middle American Ameiva
- Ameiva undulata - Rainbow Ameiva
- Anelytropsis - Mexican Blind Lizards
- Anelytropsis papillosus - Mexican Blind Lizard
- Anniella - Legless Lizards
- Anniella geronimensis - Baja California Legless Lizard
- Anniella pulchra - California Legless Lizard
- Anolis - Anoles
- Anolis allisoni - Allison's Anole
- Anolis alvarezdeltoroi - Alvarez Del Toro's Anole
- Anolis anisolepis - Chiapan Ornate Anole
- Anolis baccatus - Bocourt's Anole
- Anolis barkeri - Barker's Anole
- Anolis biporcatus - Giant Green Anole
- A. b. biporcatus - Neotropical Green Anole
- Anolis breedlovei - Breedlove's Anole
- Anolis capito - Big-headed Anole
- Anolis carolinensis - Green Anole
- A. c. carolinensis - Northern Green Anole
- A. c. seminolus - Southern Green Anole
- Anolis chlorocyanus - Hispaniolan Green Anole
- Anolis compressicauda - Malposo Scaly Anole
- Anolis crassulus - Ornate Anole
- Anolis cristatellus - Crested Anole
- A. c. cristatellus - Puerto Rican Crested Anole
- Anolis cumingi - Balsas Anole
- Anolis cuprinus - Copper Anole
- Anolis cybotes - Large-headed Anole
- A. c. cybotes - Common Large-headed Anole
- Anolis cymbops - Cope's Veracruz Anole
- Anolis damulus - Cope's Smooth Anole
- Anolis distichus - Bark Anole
- Anolis dollfusianus - Coffee Anole
- Anolis duellmani - Duellman's Pygmy Anole
- Anolis dunni - Dunn's Anole
- Anolis equestris - Knight Anole
- A. e. equestrius - Western Knight Anole
- Anolis ferreus - Comb Anole
- Anolis forbesi - Forbes's Anole
- Anolis garmani - Jamaican Giant Anole
- Anolis godovii - Gadow's Anole
- Anolis hobartsmithi - Northern Chiapas Anole
- Anolis isthmicus - Tehuantepec Anole
- Anolis laeviventris - White Anole
- Anolis lemurinus - Ghost Anole
- A. l. lemurinus - Central American Ghost Anole
- Anolis liogaster - Guerrero Anole
- Anolis macrinii - Macrinius's Anole
- Anolis matudai - Matuda's Anole
- Anolis megapholidotus - Large-scaled Anole
- Anolis microlepidotus - Guerreran Oak Anole
- Anolis microlepis - Chiapan Smooth Anole
- Anolis milleri - Miller's Anole
- Anolis naufragus - Hidalgo Anole
- Anolis nebuloides - False Clouded Anole
- Anolis nebulosus - Clouded Anole
- Anolis omiltemanus - Omilteme Anole
- Anolis parvicirculata - Berriozabal Anole
- Anolis pentaprion - Lichen Anole
- A. p. beckeri - Becker's Lichen Anole
- A. p. cristifier - Crested Lichen Anole
- Anolis petersii - Peter's Anole
- Anolis polyrhachis - Sierra Juarez Anole
- Anolis porcatus - Cuban Green Anole
- Anolis pygmaeus - Chiapan Pigmy Anole
- Anolis quercorum - Gray Anole
- Anolis rodriquezi - Rodriguez's Anole
- A. r. rodriquezi - Slender Anole
- Anolis sagrei - Brown Anole
- A. s. mayensis - Mayan Coastal Anole
- A. s. sagrei - Cuban Brown Anole
- Anolis schiedeii - Schiede's Anole
- Anolis schmidti - Schmidt's Anole
- Anolis sericus - Silky Anole
- Anolis serranoi - Serrano's Anole
- Anolis simmonsi - Simmons's Anole
- Anolis subocularis - Pacific Anole
- Anolis taylori - Taylor's Anole
- Anolis tropidonotus - Greater Scaly Anole
- A. t. spilorhipes - Upland Scaly Anole
- A. t. tropidonotus - Greater Scaly Anole
- Anolis uniformis - Lesser Scaly Anole
- Anolis utowanae - Utowana Anole
- Aristelliger - Eyelash Geckos
- Aristelliger georgeensis - Saint George Island Gecko
- Aspidoscelis - Whiptails & Racerunners
- Aspidoscelis alpina - Alpine Whiptail
- Aspidoscelis angusticeps - Yucatán Whiptail
- A. a. angusticeps - Narrowhead Yucatan Whiptail
- Aspidoscelis arizonae - Arizona Striped Whiptail
- Aspidoscelis bacatus - San Pedro Nolasco Whiptail
- Aspidoscelis burti - Canyon Spotted Whiptail
- A. b. burti - Canyon Spotted Whiptail
- A. b. stictogramma - Giant Spotted Whiptail
- A. b. xanthonota - Red-backed Whiptail
- Aspidoscelis calidipes - Rio Tepalcatepic Valley Whiptail
- Aspidoscelis cana - Salsipuedes Island Whiptail
- Aspidoscelis carmenensis - Carmen Island Orange-throated Whiptail
- Aspidoscelis catalinensis - Santa Catalina Island Whiptail
- Aspidoscelis celeripes - San Jose Island Whiptail
- Aspidoscelis ceralbensis - Cerralvo Island Whiptail
- Aspidoscelis communis - Giant Whiptail
- A. c. communis - Colima Giant Whiptail
- A. c. mariarum - Tres Marias Islands Whiptail
- Aspidoscelis costata - Western México Whiptail
- A. c. barrancorum - Barranca Whiptail
- A. c. costata - Balsas Basin Whiptail
- A. c. griseocephala - Blue-throated Whiptail
- A. c. huico - Blue-chested Whiptail
- A. c. mazatlanensis - Sinaloan Whiptail
- A. c. nigrigularis - Black-throated Whiptail
- A. c. occidentalis - Western Mexico Whiptail
- A. c. zweifeli - Zweifel's Whiptail
- Aspidoscelis cozumelae - Cozumel Racerunner
- Aspidoscelis danheimae - San Jose Island Blue-throated Whiptail
- Aspidoscelis deppei - Black-bellied Racerunner
- A. d. deppei - Black-bellied Racerunner
- A. d. infernalis - Deppe's Inferno Racerunner
- A. d. schizophora - Deppe's Split Racerunner
- Aspidoscelis dixoni - Gray-checkered Whiptail
- Aspidoscelis espiritensis - Espiritu Santo Island Whiptail
- Aspidoscelis estebanensis - San Esteban Whiptail
- Aspidoscelis exsanguis - Chihuahuan Spotted Whiptail
- Aspidoscelis flagellicauda - Gila Spotted Whiptail
- Aspidoscelis franciscensis - San Francisco Island Whiptail
- Aspidoscelis gularis - Common Spotted Whiptail
- A. g. colossa - Colossal Spotted Whiptail
- A. g. gularis - Texas Spotted Whiptail
- A. g. pallida - Pallid Spotted Whiptail
- A. g. rauni - Raun's Spotted Whiptail
- A. g. scalaris - Western Spotted Whiptail
- A. g. semiannulata - Zacatecan Spotted Whiptail
- A. g. semifasciata - Southern Coahuila Spotted Whiptail
- Aspidoscelis guttata - Mexican Racerunner
- A. g. flavilineata - Yellow-striped Racerunner
- A. g. guttata - Mexican Racerunner
- A. g. immutabilis - Cope's Racerunner
- Aspidoscelis gypsi - Little White Whiptail
- Aspidoscelis hyperythra - Orange-throated Whiptail
- A. h. beldingi - Belding's Orange-throated Whiptail
- A. h. hyperythra - Cape Orange-throated Whiptail
- Aspidoscelis inornata - Little Striped Whiptail
- A. i. chihuahuae - Chihuahua Striped Whiptail
- A. i. cienegae - Quatro Cienegas Whiptail
- A. i. heptagramma - Trans-Pecos Striped Whiptail
- A. i. inornata - Little Striped Whiptail
- A. i. junipera - Woodland Striped Whiptail
- A. i. llanuras - Plains Striped Whiptail
- A. i. paulula - Durangan Striped Whiptail
- Aspidoscelis labialis - Baja California Whiptail
- Aspidoscelis laredoensis - Laredo Striped Whiptail
- Aspidoscelis lineatissima - Many-lined Whiptail
- A. l. duodecemlineata - Twelve-lined Whiptail
- A. l. exorista - Michoacán Many-lined Whiptail
- A. l. lineatissima - Many-lined Whiptail
- A. l. livida - Blue Many-lined Whiptail
- Aspidoscelis marmorata - Marbled Whiptail
- A. m. marmorata - Western Marbled Whiptail
- A. m. reticuloriens - Eastern Marbled Whiptail
- Aspidoscelis maslini - Maslin's Racerunner
- Aspidoscelis maxima - Cape Region Whiptail
- Aspidoscelis mexicana - Mexican Whiptail
- Aspidoscelis motaguae - Giant Whiptail
- Aspidoscelis neomexicana - New Mexico Whiptail
- Aspidoscelis neotesselata - Colorado Checkered Whiptail
- Aspidoscelis opatae - Opata Whiptail
- Aspidoscelis pai - Pai Striped Whiptail
- Aspidoscelis parvisocia - Mexican Pygmy Whiptail
- Aspidoscelis picta - Monserrate Island Whiptail
- Aspidoscelis rodecki - Rodeck's Whiptail
- Aspidoscelis sackii - Sack's Spotted Whiptail
- A. s. gigas - Giant Spotted Whiptail
- A. s. sackii - Sack's Spotted Whiptail
- Aspidoscelis septemvittata - Plateau Spotted Whiptail
- A. s. septemvittata - Plateau Spotted Whiptail
- Aspidoscelis sexlineata - Six-lined Racerunner
- A. s. sexlineata - Six-lined Racerunner
- A. s. stephensae - Texas Yellowhead Racerunner
- A. s. viridis - Prairie Racerunner
- Aspidoscelis sonorae - Sonoran Spotted Whiptail
- Aspidoscelis tesselata - Common Checkered Whiptail
- Aspidoscelis tigris - Western Whiptail
- A. t. aethiops - Sonoran Tiger Whiptail
- A. t. dickersonae - Dickerson's Desert Whiptail
- A. t. munda - California Whiptail
- A. t. nigroriens - Eastern Blackthroat Whiptail
- A. t. pulcher - Beautiful Marbled Whiptail
- A. t. punctata - Spotted Tiger Whiptail
- A. t. punctilinealis - Southern Whiptail
- A. t. rubida - Pinktail Whiptail
- A. t. septentrionalis - Northern Whiptail
- A. t. stejnegeri - Coastal Whiptail
- A. t. tigris - Great Basin Whiptail
- A. t. vandenburghi - Carmen Island Whiptail
- A. t. variolosa - Spotted Western Whiptail
- A. t. vivida - South Coronado Island Whiptail
- Aspidoscelis uniparens - Desert Grassland Whiptail
- Aspidoscelis velox - Plateau Striped Whiptail
- Aspidoscelis xanthonota - Redback Whiptail
- Barisia - Mexican Alligator Lizards
- Barisia ciliaris - Northern Alligator Lizard
- Barisia herrerae - Herrera's Alligator Lizard
- Barisia imbricata - Transvolcanic Alligator Lizard
- Barisia jonesi - Jones's Alligator Lizard
- Barisia levicollis - Chihuahuan Alligator Lizard
- Barisia planifrons - Oaxacan Alligator Lizard
- Barisia rudicollis - Rough-necked Alligator Lizard
- Basiliscus - Basilisks
- Basiliscus vittatus - Brown Basilisk
- Callisaurus - Zebratail Lizards
- Callisaurus draconoides - Zebratail Lizard
- C. d. bogerti - Bogert's Zebra-tailed Lizard
- C. d. brevipes - Short-footed Zebra-tailed Lizard
- C. d. carmenensis - Carmen Island Zebra-tailed Lizard
- C. d. crinitus - Viscaino Zebra-tailed Lizard
- C. d. draconoides - Common Zebra-tailed Lizard
- C. d. inusitatus - Sonoran Zebra-tailed Lizard
- C. d. myurus - Northern Zebra-tailed Lizard
- C. d. rhodostictus - Western Zebra-tailed Lizard
- C. d. splendidus - Angel Island Zebra-tailed Lizard
- C. d. ventralis - Eastern Zebra-tailed Lizard
- Callisaurus draconoides - Zebratail Lizard
- Calotes - Bloodsuckers
- Calotes mystaceus - Indochinese Bloodsucker
- Calotes versicolor - Variable Bloodsucker
- Chamaeleo - Chameleons
- Chamaeleo calyptratus - Veiled Chameleon
- Chamaeleo jacksonii - Jackson's Chameleon
- Chondrodactylus - Sand Geckos
- Chondrodactylus bibronii - Bibron's Sand Gecko
- Cnemidophorus - Tropical Whiptails
- Cnemidophorus lemniscatus - Rainbow Whiptail
- Coleonyx - Banded Geckos
- Coleonyx brevis - Texas Banded Gecko
- Coleonyx elegans - Elegant Banded Gecko
- C. e. elegans - Yucatan Banded Gecko
- C. e. nemoralis - Colima Banded Gecko
- Coleonyx fasciatus - Black Banded Gecko
- Coleonyx gypsicolus - San Marcos Island Gecko
- Coleonyx reticulatus - Reticulate Gecko
- Coleonyx switaki - Penninsular Banded Gecko
- Coleonyx variegatus - Western Banded Gecko
- C. v. abbotti - San Diego Banded Gecko
- C. v. bogerti - Tucson Banded Gecko
- C. v. peninsularis - San Lucan Banded Gecko
- C. v. sonoriensis - Sonoran Banded Gecko
- C. v. utahensis - Utah Banded Gecko
- C. v. variegatus - Desert Banded Gecko
- Cophosaurus - Greater Earless Lizards
- Cophosaurus texanus - Greater Earless Lizard
- C. t. reticulatus - Sonoran Earless Lizard
- C. t. scitulus - SouthWestern Earless Lizard
- C. t. texanus - Texas Earless Lizard
- Cophosaurus texanus - Greater Earless Lizard
- Corytophanes - Helmeted Basilisks
- Corytophanes cristatus - Smooth-headed Helmeted Basilisk
- Corytophanes hernandezii - Hernandez's Helmeted Basilisk
- Corytophanes percarinatus - Keeled Helmeted Basilisk
- Cosymbotus - Asian House Geckos
- Cosymbotus platyurus - Flat-tailed House Gecko
- Crotaphytus - Collared Lizards
- Crotaphytus antiquus - Venerable Collared Lizard
- Crotaphytus bicinctores - Great Basin Collared Lizard
- Crotaphytus collaris - Eastern Collared Lizard
- Crotaphytus dickersonae - Mexican Blue-collared Lizard
- Crotaphytus grismeri - Sierra Los Cucupas Collared Lizard
- Crotaphytus insularis - Desert Collared Lizard
- Crotaphytus nebrius - Sonoran Collared Lizard
- Crotaphytus reticulatus - Reticulate Collared Lizard
- Crotaphytus vestigium - Baja California Collared Lizard
- Cryptoblepharus - Snake-eyed Skinks
- Cryptoblepharus poecilopleurus - Mottled Snake-eyed Skink
- Ctenosaura - Spiny-tailed Iguanas
- Ctenosaura acanthura - Mexican Spiny-tailed Iguana
- Ctenosaura alfredschmidtii - Campeche Spiny-tailed Iguana
- Ctenosaura clarkii - Michiocan Club Tail
- Ctenosaura conspicuosa - San Esteban Island Spiny-tailed Iguana
- Ctenosaura defensor - Yucatán Spiny-tailed Iguana
- Ctenosaura hemilopha - Cape Spiny-tailed Iguana
- C. h. hemilopha - Peninsular Spiny-tailed Iguana
- C. h. interrupta - Cap San Lucas Iguana
- Ctenosaura macrolopha - Sonoran Spiny-tailed Iguana
- Ctenosaura nolascensis - San Pedro Nolasco Spiny-tailed Iguana
- Ctenosaura oaxacana - Oaxaca Spiny-tailed Iguana
- Ctenosaura pectinata - Mexican Spiny-tailed Iguana
- Ctenosaura quinquecarinatus - Oaxacan Spiny-tailed Iguana
- Ctenosaura similis - Gray's Spiny-tailed Iguana
- C. s. similis - Gray's Spiny-tailed Iguana
- Cyrtopodion - Bowfoot Geckos
- Cyrtopodion scabrum - Rough-tailed Gecko
- Diploglossus - Galliwasps
- Diploglossus enneagrammus - Huaxteca Lesser Galliwasp
- Diploglossus legnotus - Pueblan Galliwasp
- Diploglossus rozellae - Rozella's Canopy Lizard
- Dipsosaurus - Desert Iguanas
- Dipsosaurus catalinensis - Santa Catalina Island Desert Iguana
- Dipsosaurus dorsalis - Desert Iguana
- D. d. dorsalis - Northern Desert Iguana
- D. d. lucasensis - San Lucan Desert Iguana
- D. d. sonoriensis - Sonoran Desert Iguana
- Elgaria - Western Alligator Lizards
- Elgaria cedrosensis - Cedros Island Alligator Lizard
- Elgaria coerulea - Northern Alligator Lizard
- E. c. coerulea - San Francisco Alligator Lizard
- E. c. palmeri - Sierra Alligator Lizard
- E. c. principis - Northwestern Alligator Lizard
- E. c. shastensis - Shasta Alligator Lizard
- Elgaria kingii - Madrean Alligator Lizard
- E. k. ferruginea - Rusty Alligator Lizard
- E. k. kingii - Madrean Alligator Lizard
- E. k. nobilis - Arizona Alligator Lizard
- Elgaria multicarinata - Southern Alligator Lizard
- E. m. ignava - San Martin Alligator Lizard
- E. m. multicarinata - California Alligator Lizard
- E. m. scincicauda - Oregon Alligator Lizard
- E. m. webbii - San Diego Alligator Lizard
- Elgaria nana - Islas Coronados Alligator Lizard
- Elgaria panamintina - Panamint Alligator Lizard
- Elgaria parva - Pigmy Alligator Lizard
- Elgaria paucicarinata - San Lucan Alligator Lizard
- Elgaria velazquezi - Central Baja California Alligator Lizard
- Emoia - Emoias
- Emoia cyanura - Copper-tailed Skink
- Emoia impar - Azure-tailed Skink
- Furcifer - Madagascar Chameleons
- Furcifer oustaleti - Oustalet's Chameleon
- Gambelia - Leopard Lizards
- Gambelia copei - Cope's Leopard Lizard
- Gambelia sila - Bluntnose Leopard Lizard
- Gambelia wislizenii - Longnose Leopard Lizard
- Gehyra - Dtellas
- Gehyra mutilata - Mutilating Gecko
- Gekko - Tropical Asian Geckos
- Gekko gecko - Tokay Gecko
- Gekko ulikovskii - Golden Gecko
- Gerrhonotus - Eastern Alligator Lizards
- Gerrhonotus infernalis - Texas Alligator Lizard
- G. i. austrinus - Alligator Snake Lizard
- G. i. infernalis - Texas Alligator Lizard
- G. i. loweryi - Lowery's Alligator Lizard
- G. i. taylori - Taylor's Alligator Lizard
- Gerrhonotus liocephalus - Weigman's Alligator Lizard
- Gerrhonotus lugoi - Lugo's Alligator Lizard
- Gerrhonotus ophiurus - Snake Lizard
- Gerrhonotus infernalis - Texas Alligator Lizard
- Gonatodes - Bent-toed Geckos
- Gonatodes albogularis - Yellow-headed Gecko
- G. a. fuscus - Dusky Yellow-headed Gekco
- Gonatodes albogularis - Yellow-headed Gecko
- Gymnophthalmus -
- Gymnophthalmus speciosus - Golden Spectacled Lizard
- G. s. sumichrasti - Sumichrast's Golden Spectacled Lizard
- Gymnophthalmus speciosus - Golden Spectacled Lizard
- Heloderma - Gila Monsters
- Heloderma horridum - Beaded Lizard
- H. h. alvarezi - Black Beaded Lizard
- H. h. exasperatum - Rio Fuertes Beaded Lizard
- H. h. horridum - Mexican Beaded Lizard
- Heloderma suspectum - Gila Monster
- H. s. cinctum - Banded Gila Monster
- H. s. suspectum - Reticulate Gila Monster
- Heloderma horridum - Beaded Lizard
- Hemidactylus - House Geckos
- Hemidactylus brooki - Brook's Gecko
- H. b. brooki - Brook's Gecko
- Hemidactylus frenatus - Common House Gecko
- Hemidactylus garnotii - Indo-Pacific Gecko
- Hemidactylus mabouia - Wood Slave
- Hemidactylus platyurus - Asian Flat-tailed House Gecko
- Hemidactylus turcicus - Mediterranean House Gecko
- H. t. turcicus - Turkish House Gecko
- Hemidactylus brooki - Brook's Gecko
- Hemiphyllodactylus - Gypsy Geckos
- Hemiphyllodactylus typus - Indo-pacific Tree Gecko
- Holbrookia - Earless Lizards
- Holbrookia approximans - Speckled Earless Lizard
- Holbrookia elegans - Elegant Earless Lizard
- H. e. elegans - Canyon Earless Lizard
- H. e. thermophila - Sonoran Earless Lizard
- Holbrookia lacerata - Spot-tailed Earless Lizard
- H. l. lacerata - Northern Spot-tailed Earless Lizard
- H. l. subcaudalis - Southern Spot-tailed Earless Lizard
- Holbrookia maculata - Lesser Earless Lizard
- H. m. approximans - Speckled Earless Lizard
- H. m. bunkeri - Bunker's Earless Lizard
- H. m. flavilenta - Striped Earless Lizard
- H. m. maculata - Great Plains Earless Lizard
- H. m. perspicua - Prairie Earless Lizard
- H. m. pulchra - Huachuca Earless Lizard
- H. m. ruthveni - Bleached Earless Lizard
- Holbrookia propinqua - Keeled Earless Lizard
- H. p. piperata - Southern Keeled Earless Lizard
- H. p. propinqua - Northern Keeled Earless Lizard
- Iguana - Green Iguanas
- Iguana iguana - Green Iguana
- Lacerta - Lacertas
- Lacerta bilineata - Western Green Lizard
- Lacerta viridis - European Green Lizard
- Laemanctus - Casque-headed Iguanas
- Laemanctus longipes - Eastern Casque-headed Iguana
- L. l. deborrei - Smooth Casque-headed Iguana
- L. l. longipes - Casque-headed Basilisk
- Laemanctus serratus - Serrated Casque-headed Iguana
- L. s. alticoronatus - Serrated Casque-headed Iguana
- L. s. mccoyi - McCoy's Casque-headed Iguana
- L. s. serratus - Serrated Casque-headed Basilisk
- Laemanctus longipes - Eastern Casque-headed Iguana
- Lampropholis - Sunskinks
- Lampropholis delicata - Plague Skink
- Leiocephalus - Curly-tailed Lizards
- Leiocephalus carinatus - Northern Curly-tailed Lizard
- Leiocephalus schreibersii - Red-sided Curly-tailed Lizard
- Leiolepis - Butterfly Lizards
- Leiolepis belliana - Butterfly Lizard
- Lepidodactylus - Indo-Pacific Geckos
- Lepidodactylus lugubris - Mourning Gecko
- Lepidophyma - Tropical Night Lizards
- Lepidophyma chicoasensis - Sumidero Tropical Night Lizard
- Lepidophyma dontomasi - MacDougall's Tropical Night Lizard
- Lepidophyma flavimaculatum - Yellow-spotted Night Lizard
- Lepidophyma gaigeae - Gaige's Tropical Night Lizard
- Lepidophyma lineri - Liner's Tropical Night Lizard
- Lepidophyma lipetzi - Lipetz's Tropical Night Lizard
- Lepidophyma lowei - Lowe's Tropical Night Lizard
- Lepidophyma micropholis - Cave Tropical Night Lizard
- Lepidophyma occulor - Jalpan Tropical Night Lizard
- Lepidophyma pajapanensis - Pajapan Tropical Night Lizard
- Lepidophyma radula - Yautepec Tropical Night Lizard
- Lepidophyma smithi - Smith's Tropical Night Lizard
- Lepidophyma sylvaticum - Madrean Tropical Night Lizard
- Lepidophyma tarascae - Tarascan Tropical Night Lizard
- Lepidophyma tuxtlae - Tuxtla Tropical Night Lizard
- Lipinia - Lipinias
- Lipinia noctua - Moth Skink
- Mabuya - American Shiny Skinks
- Mabuya multifasciata - Brown Mabuya
- Mabuya unimarginata - Central American Mabuya
- Mesaspis - Middle American Alligator Lizards
- Mesaspis antauges - Mount Orizaba Alligator Lizard
- Mesaspis gadovii - Gadow's Alligator Lizard
- M. g. gadovii - Godow's Alligator Lizard
- M. g. levigata - Smoth Alligator Lizard
- Mesaspis juarezi - Sierra Juarez Alligator Lizard
- Mesaspis moreleti - Morelet's Alligator Lizard
- M. m. rafaeli - Rafael's Alligator Lizard
- M. m. temporalis - Temporal Alligator Lizard
- Mesaspis viridiflava - Dwarf Alligator Lizard
- Mesoscincus - Middle American Skinks
- Mesoscincus altamirani - Tepalcatepec Skink
- Mesoscincus schwartzei - Schwartze's Skink
- Ophisaurus - Glass Lizards
- Ophisaurus attenuatus - Slender Glass Lizard
- O. a. attenuatus - Western Slender Glass Lizard
- O. a. longicaudus - Eastern Slender Glass Lizard
- Ophisaurus ceroni - Ceron's Glass Lizard
- Ophisaurus compressus - Island Glass Lizard
- Ophisaurus incomptus - Plain-necked Glass Lizard
- Ophisaurus mimicus - Mimic Glass Lizard
- Ophisaurus ventralis - Eastern Glass Lizard
- Ophisaurus attenuatus - Slender Glass Lizard
- Pachydactylus - Thick-toed Geckos
- Pachydactylus bibronii - Bibron's Thick-toed Gecko
- Petrosaurus - Rock Lizards
- Petrosaurus mearnsi - Banded Rock Lizard
- Petrosaurus repens - Short-nosed Rock Lizard
- Petrosaurus slevini - Slevin's Banded Rock Lizard
- Petrosaurus thalassinus - San Lucan Rock Lizard
- Phelsuma - Day Geckos
- Phelsuma guimbeaui - Orange-spotted Day Gecko
- Phelsuma laticauda - Gold Dust Day Gecko
- Phelsuma madagascariensis - Madagascar Day Gecko
- Phrynosoma - Horned Lizards
- Phrynosoma asio - Giant Horned Lizard
- Phrynosoma blainvillii - Blainville's Horned Lizard
- Phrynosoma braconnieri - Short-tailed Horned Lizard
- Phrynosoma cerroense - Vizcaíno Horned Lizard
- Phrynosoma cornutum - Texas Horned Lizard
- Phrynosoma coronatum - Cape Horned Lizard
- Phrynosoma ditmarsi - Rock Horned Lizard
- Phrynosoma douglasii - Pygmy Short-horned Lizard
- Phrynosoma goodei - Goode's Horned Lizard
- Phrynosoma hernandesi - Greater Short-horned Lizard
- P. h. brachycercum - Smith's Short-horned Lizard
- P. h. hernandesi - Hernandez's Short-horned Lizard
- Phrynosoma mcallii - Flat-tailed Horned Lizard
- Phrynosoma modestum - Round-tailed Horned Lizard
- Phrynosoma orbiculare - Mountain Horned Lizard
- P. o. boucardii - Boucard's Horned Lizard
- P. o. bradti - Sierra Madre Horned Lizard
- P. o. cortezii - Cortez's Horned Lizard
- P. o. dugesii - Dugès's Horned Lizard
- P. o. orbiculare - Mountain Horned Lizard
- P. o. orientale - Eastern Mountain Horned Lizard
- Phrynosoma platyrhinos - Desert Horned Lizard
- P. p. calidiarum - Southern Desert Horned Lizard
- P. p. platyrhinos - Northern Desert Horned Lizard
- Phrynosoma solare - Regal Horned Lizard
- Phrynosoma taurus - Mexican Horned Lizard
- Phrynosoma wigginsi - Concepción Horned Lizard
- Phyllodactylus - Leaf-toed Geckos
- Phyllodactylus angelensis - Angel Island Leaf-toed Gecko
- Phyllodactylus apricus - Las Animas Island Gecko
- Phyllodactylus bordai - Guerreran Leaf-toed Gecko
- Phyllodactylus bugastrolepis - Catalina Island Leaf-toed Gecko
- Phyllodactylus davisi - Davis's Leaf-toed Gecko
- Phyllodactylus delcampoi - Del Campos's Leaf-toed Gecko
- Phyllodactylus duellmani - Duellman's Pygmy Leaf-toed Gecko
- Phyllodactylus homolepidurus - Sonoran Leaf-toed Gecko
- P. h. homolepidurus - Sonoran Leaf-toed Gecko
- P. h. nolascoensis - San Pedro Nolasco Gecko
- Phyllodactylus lanei - Lane's Leaf-toed Gecko
- P. l. isabelae - Islas Marietas Leaf-toed Gecko
- P. l. lanei - Lane's Leaf-toed Gecko
- P. l. rupinus - Michoacán Leaf-toed Gecko
- Phyllodactylus muralis - Oaxacan Leaf-toed Gecko
- P. m. isthmus - Isthmian Leaf-toed Gecko
- P. m. muralis - Oaxacan Leaf-toed Gecko
- Phyllodactylus nocticolus - Penninsular Leaf-toed Gecko
- P. n. acorius - San Diego Island Leaf-toed Gecko
- P. n. angulus - Salsipuedes Islands Leaf-toed Gecko
- P. n. circus - San Ildefonso Island Leaf-toed Gecko
- P. n. coronatus - Coronados Island Leaf-toed Gecko
- P. n. estebanensis - San Esteban Island Leaf-toed Gecko
- P. n. nocticolus - Peninsula Leaf-toed Gecko
- P. n. sloani - Sloan's Leaf-toed Gecko
- P. n. zweifeli - Zweifel's Leaf-toed Gecko
- Phyllodactylus partidus - Isla Pardita Norte Leaf-toed Gecko
- Phyllodactylus paucituberculatus - Rio Marquez Valley Gecko
- Phyllodactylus santacruzensis - Santa Cruz Leaf-toed Gecko
- Phyllodactylus tinklei - Raza Island Leaf-toed Gecko
- Phyllodactylus tuberculosus - Yellow-bellied Gecko
- P. t. ingeri - Inger's Yellow-bellied Gecko
- P. t. magnus - Greater Yellow-bellied Gecko
- P. t. saxatilis - Stone Yellow-bellied Gecko
- Phyllodactylus unctus - San Lucan Gecko
- Phyllodactylus xanti - Xantus Leaf-toed Gecko
- Plestiodon - Skinks
- Plestiodon anthracinus - Coal Skink
- P. a. anthracinus - Northern Coal Skink
- P. a. pluvialis - Southern Coal Skink
- Plestiodon brevirostris - Shortnose Skink
- P. b. bilineatus - Two-lined Shortnose Skink
- P. b. brevirostris - Eastern Shortnose Skink
- P. b. dicei - Dice's Shortnose Skink
- P. b. indubitus - Mexican Shortnose Skink
- P. b. pineus - Pine Woods Shortnose Skink
- Plestiodon callicephalus - Mountain Skink
- Plestiodon colimensis - Colima Skink
- Plestiodon copei - Cope's Skink
- Plestiodon dugesii - Dugès's Skink
- Plestiodon egregius - Mole Skink
- P. e. egregius - Florida Keys Mole Skink
- P. e. insularis - Cedar Key Mole Skink
- P. e. lividus - Bluetail Mole Skink
- P. e. onocrepis - Peninsula Mole Skink
- P. e. similis - Northern Mole Skink
- Plestiodon fasciatus - Five-lined Skink
- Plestiodon gilberti - Gilbert's Skink
- P. g. arizonensis - Arizona Skink
- P. g. cancellosus - Variegated Skink
- P. g. gilberti - Greater Brown Skink
- P. g. placerensis - Northern Brown Skink
- P. g. rubricaudatus - Western Redtail Skink
- Plestiodon inexpectatus - Southeastern Five-lined Skink
- Plestiodon lagunensis - San Lucan Skink
- Plestiodon laticeps - Broadhead Skink
- Plestiodon lynxe - Oak Forest Skink
- P. l. belli - Bell's Oak Forest Skink
- P. l. lynxe - Eastern Oak Forest Skink
- Plestiodon multilineatus - Chihuahuan Skink
- Plestiodon multivirgatus - Many-lined Skink
- P. m. epipleurotus - Variable Skink
- P. m. multivirgatus - Northern Many-lined Skink
- Plestiodon obsoletus - Great Plains Skink
- Plestiodon ochoterenae - Guerreran Skink
- Plestiodon parviauriculatus - Northern Pygmy Skink
- Plestiodon parvulus - Southern Pygmy Skink
- Plestiodon reynoldsi - Sand Skink
- Plestiodon septentrionalis - Northern Prairie Skink
- P. s. obtusirostris - Southern Prairie Skink
- P. s. pallidus - Pallid Skink
- P. s. septentrionalis - Northern Prairie Skink
- Plestiodon skiltonianus - Western Skink
- P. s. interparietalis - Coronado Island Skink
- P. s. skiltonianus - Western Skink
- P. s. utahensis - Great Basin Skink
- Plestiodon sumichrasti - Sumichrast's Skink
- Plestiodon tetragrammus - Four-lined Skink
- P. t. brevilineatus - Short-lined Skink
- P. t. tetragrammus - Long-lined Skink
- Plestiodon anthracinus - Coal Skink
- Podarcis - Wall Lizards
- Podarcis muralis - Common Wall Lizard
- Podarcis sicula - Italian Wall Lizard
- Sauromalus - Chuckwallas
- Sauromalus ater - Common Chuckwalla
- Sauromalus australis - Peninsular Chuckwalla
- Sauromalus hispidus - Spiny Chuckwalla
- Sauromalus klauberi - Spotted Chuckwalla
- Sauromalus slevini - Monserrat Chuckwalla
- Sauromalus varius - Piebald Chuckwalla
- Sceloporus - Spiny Lizards
- Sceloporus acanthinus - Bocourt's Spiny Lizard
- Sceloporus adleri - Adler's Spiny Lizard
- Sceloporus aeneus - Black-bellied Bunchgrass Lizard
- S. a. aeneus - Anahuacan Bunchgrass Lizard
- S. a. subniger - Plateau Bunchgrass Lizard
- Sceloporus anahuacus - Anahuacan Bunchgrass Lizard
- Sceloporus angustus - Santa Cruz Island Sator
- Sceloporus arenicolus - Dunes Sagebrush Lizard
- Sceloporus asper - Boulenger's Scaly Lizard
- Sceloporus bicanthalis - Trans-volcanic Bunchgrass Lizard
- Sceloporus bimaculosus - Twin-spotted Spiny Lizard
- Sceloporus bulleri - Buller's Spiny Lizard
- Sceloporus carinatus - Keeled Spiny Lizard
- Sceloporus cautus - Shy Spiny Lizard
- Sceloporus chaneyi - Chaney's Spiny Lizard
- Sceloporus chrysostictus - Yellow-spotted Spiny Lizard
- Sceloporus clarkii - Clark's Spiny Lizard
- S. c. boulengeri - Southern Clark's Spiny Lizard
- S. c. clarkii - Sonoran Spiny Lizard
- S. c. vallaris - Plateau Spiny Lizard
- Sceloporus consobrinus - Prairie Lizard
- Sceloporus couchii - Couch's Spiny Lizard
- Sceloporus cowlesi - Southwestern Fence Lizard
- Sceloporus cozumelae - Cozumel Spiny Lizard
- Sceloporus cryptus - Sierra Juarez Spiny Lizard
- Sceloporus cupreus - Golden Longtail Spiny Lizard
- Sceloporus cyanogenys - Blue-chinned Rough-scaled Lizard
- Sceloporus cyanostictus - Blue Spiny Lizard
- Sceloporus dugesii - Dugès's Spiny Lizard
- S. d. dugesii - Eastern Dugès's Spiny Lizard
- S. d. intermedius - Western Dugés's Spiny Lizard
- Sceloporus edbelli - Bell's Lizard
- Sceloporus edwardtaylori - Taylor's Spiny Lizard
- Sceloporus exsul - Queretaran Desert Lizard
- Sceloporus formosus - Mexican Emerald Spiny Lizard
- S. f. formosus - Common Mexican Emerald Spiny Lizard
- S. f. scitulus - Striated Mexican Emerald Spiny Lizard
- Sceloporus gadovae - Gadow's Spiny Lizard
- Sceloporus goldmani - Goldman's Bunchgrass Lizard
- Sceloporus graciosus - Common Sagebrush Lizard
- S. g. gracilis - Western Sagebrush Lizard
- S. g. graciosus - Northern Sagebrush Lizard
- S. g. vandenburgianus - Southern Sagebrush Lizard
- Sceloporus grammicus - Graphic Lizard
- S. g. disparilis - Northeastern Graphic Lizard
- S. g. grammicus - Southern Plateau Graphic Lizard
- S. g. microlepidotus - Mesquite Lizard
- S. g. tamaulipensis - Sierra Tamaulipas Mesquite Lizard
- Sceloporus grandaevus - Cerralvo Island Sator
- Sceloporus halli - Hall's Spiny Lizard
- Sceloporus heterolepis - Odd-scaled Spiny Lizard
- Sceloporus horridus - Rough Lizard
- S. h. horridus - Southern Rough Lizard
- S. h. oligoporus - Few-pored Rough Lizard
- Sceloporus hunsakeri - Hunsaker's Spiny Lizard
- Sceloporus insignis - Coalcoman Black-collared Lizard
- Sceloporus internasalis - Mail-snouted Spiny Lizard
- Sceloporus jalapae - Xalapa Spiny Lizard
- Sceloporus jarrovii - Yarrow's Lizard
- Sceloporus lemosespinali - Lemos-Espinal's Spiny Lizard
- Sceloporus licki - Cape Arboreal Spiny Lizard
- Sceloporus lineatulus - Santa Catalina Spiny Lizard
- Sceloporus lineolateralis - Yarrow's Durangle Spiny Lizard
- Sceloporus lundelli - Lundell's Spiny Lizard
- S. l. gaigeae - Gaige's Spiny Lizard
- S. l. lundelli - Lundell's Spiny Lizard
- Sceloporus macdougalli - MacDougall's Spiny Lizard
- Sceloporus maculosus - Spotted Spiny Lizard
- Sceloporus magister - Desert Spiny Lizard
- S. m. cephaloflavus - Orange-headed Spiny Lizard
- S. m. magister - Purple-backed Spiny Lizard
- S. m. transversus - Barred Spiny Lizard
- Sceloporus megalepidurus - Cursorial Spiny Lizard
- S. m. megalepidurus - White-bellied Cursorial Spiny Lizard
- S. m. pictus - Painted Cursorial Spiny Lizard
- Sceloporus melanorhinus - Black-nosed Lizard
- S. m. calligaster - Pastel-bellied Tree Lizard
- S. m. melanorhinus - Southern Black-nosed Lizard
- Sceloporus merriami - Canyon Lizard
- S. m. annulatus - Big Bend Canyon Lizard
- S. m. australis - Southeastern Canyon Lizard
- S. m. ballingeri - Ballinger's Canyon Lizard
- S. m. longipunctatus - Presidio Canyon Lizard
- S. m. merriami - Merriam's Canyon Lizard
- S. m. sanojae - Sanoja's Canyon Lizard
- S. m. williamsi - Williams' Canyon Lizard
- Sceloporus minor - Minor Lizard
- S. m. cyaneus - Northern Blue Mountain Lizard
- S. m. erythrocyaneus - Red-spotted Minor Lizard
- S. m. immucronatus - Southern Blue Minor Lizard
- S. m. minor - Red Minor Lizard
- Sceloporus mucronatus - Cleft Lizard
- S. m. aureolus - Eastern Cleft Spiny Lizard
- S. m. mucronatus - Central Cleft Spiny Lizard
- S. m. olsoni - Olson's Cleft Spiny Lizard
- S. m. omiltemanus - Southern Cleft Spiny Lizard
- Sceloporus nelsoni - Nelson's Spiny Lizard
- S. n. barrancarum - Northern Nelson's Spiny Lizard
- S. n. nelsoni - Southern Nelson's Spiny Lizard
- Sceloporus oberon - Royal Lesser Minor Lizard
- Sceloporus occidentalis - Western Fence Lizard
- S. o. becki - Island Fence Lizard
- S. o. biseriatus - San Joaquin Fence Lizard
- S. o. bocourtii - Coast Range Fence Lizard
- S. o. longipes - Great Basin Fence Lizard
- S. o. occidentalis - NorthWestern Fence Lizard
- S. o. taylori - Sierra Fence Lizard
- Sceloporus ochoterenae - Ochoterena's Snub-nosed Spiny Lizard
- Sceloporus olivaceus - Texas Spiny Lizard
- Sceloporus orcutti - Granite Spiny Lizard
- Sceloporus ornatus - Ornate Spiny Lizard
- Sceloporus palaciosi - Palacios's Bunchgrass Lizard
- Sceloporus parvus - Blue-bellied Lizard
- Sceloporus poinsettii - Crevice Spiny Lizard
- S. p. axtelli - Texas Crevice Spiny Lizard
- S. p. macrolepis - Western Crevice Spiny Lizard
- S. p. poinsettii - New Mexico Crevice Spiny Lizard
- S. p. polylepis - Smallscale Spiny Lizard
- Sceloporus prezygus - Chiapan Rough-scaled Lizard
- Sceloporus pyrocephalus - Red-headed Spiny Lizard
- Sceloporus rufidorsum - Mexican Desert Spiny Lizard
- Sceloporus salvini - Salvin's Spiny Lizard
- Sceloporus samcolemani - Coleman's Bunchgrass Lizard
- Sceloporus scalaris - Light-bellied Bunchgrass Lizard
- S. s. brownorum - Brown's Bunchgrass Lizard
- S. s. scalaris - Highlands Bunchgrass Lizard
- S. s. unicanthalis - Southwestern Bunchgrass Lizard
- Sceloporus serrifer - Rough-scaled Lizard
- S. s. plioporus - West Gulf Rough-scaled Lizard
- S. s. serrifer - Yucatecan Rough-scaled Lizard
- Sceloporus shannonorum - Shannon's Spiny Lizard
- Sceloporus siniferus - Long-tailed Spiny Lizard
- Sceloporus slevini - Slevin's Bunchgrass Lizard
- Sceloporus smaragdinus - Bocourt's Emerald Spiny Lizard
- Sceloporus smithi - Smith's Rose-bellied Lizard
- Sceloporus spinosus - Eastern Spiny Lizard
- S. s. apicalis - Miahuatlan Spiny Lizard
- S. s. caeruleopunctatus - Blue-spotted Spiny Lizard
- S. s. spinosus - Wiegmann's Spiny Lizard
- Sceloporus squamosus - Dwarf Spiny Lizard
- Sceloporus stejnegeri - Stejneger's Spiny Lizard
- Sceloporus subpictus - Soutern Cursorial Lizard
- Sceloporus sugillatus - Zempoala Bar-bellied Lizard
- Sceloporus taeniocnemis - Nuclear Emerald Spiny Lizard
- S. t. hartwegi - Hartweg's Emerald Spiny Lizard
- S. t. taeniocnemis - Guatemalan Emerald Spiny Lizard
- Sceloporus tanneri - Tanner's Spiny Lizard
- Sceloporus teapensis - Teapen Rose-bellied Lizard
- Sceloporus torquatus - Torquate Lizard
- S. t. binocularis - Nuevo Leon Torquate Lizard
- S. t. madrensis - Lesser Torquate Lizard
- S. t. melanogaster - Central Plateau Torquate Lizard
- S. t. mikeprestoni - Preston's Torquate Lizard
- S. t. torquatus - Wiegmann's Torquate Lizard
- Sceloporus tristichus - Plateau Fence Lizard
- Sceloporus undulatus - Eastern Fence Lizard
- S. u. speari - Spear's Prairie Lizard
- Sceloporus uniformis - Yellow-backed Spiny Lizard
- Sceloporus variabilis - Rose-bellied Lizard
- S. v. marmoratus - Texas Rose-bellied Lizard
- S. v. variabilis - Southern Rose-bellied Lizard
- Sceloporus virgatus - Striped Plateau Lizard
- Sceloporus woodi - Florida Scrub Lizard
- Sceloporus zosteromus - Baja California Spiny Lizard
- S. z. monserratensis - Central Baja Spiny Lizard
- S. z. rufidorsum - Red-backed Spiny Lizard
- S. z. zosteromus - San Lucan Spiny Lizard
- Scincella - Ground Skinks
- Scincella gemmingeri - Forest Ground Skink
- S. g. forbesorum - Forbes's Forest Ground Skink
- S. g. gemmingeri - Cope's Forest Ground Skink
- Scincella lateralis - Little Brown Skink
- Scincella silvicola - Taylor's Ground Skink
- S. s. caudaequinae - Horsetail Falls Ground Skink
- S. s. silvicola - Taylor's Ground Skink
- Scincella gemmingeri - Forest Ground Skink
- Sphaerodactylus - Dwarf Geckos
- Sphaerodactylus argus - Ocellated Gecko
- S. a. argus - Common Ocellated Gecko
- Sphaerodactylus elegans - Ashy Gecko
- Sphaerodactylus glaucus - Dwarf Gecko
- Sphaerodactylus millepunctatus - Spotted Gecko
- Sphaerodactylus notatus - Reef Gecko
- S. n. notatus - Florida Reef Gecko
- Sphaerodactylus argus - Ocellated Gecko
- Sphenomorphus - Forest Skinks
- Sphenomorphus assatus - Ground Skink
- S. a. assatus - Red Forest Skink
- S. a. taylori - Taylor's Forest Skink
- Sphenomorphus cherriei - Brown Forest Skink
- S. c. cherriei - Brown Ground Forest Skink
- S. c. ixbaac - Ixbaac Brown Forest Skink
- S. c. stuarti - Stuart's Brown Forest Skink
- Sphenomorphus incertus - Stuart's Forest Skink
- Sphenomorphus assatus - Ground Skink
- Tarentola - Wall Geckos
- Tarentola annularis - Ringed Wall Gecko
- Tarentola mauritanica - Moorish Wall Gecko
- Thecadactylus - Turniptail Geckos
- Thecadactylus rapicaudus - Tuniptail Gecko
- Tupinambis - Tegus
- Tupinambis merianae - Argentine Giant Tegu
- Uma - Fringe-toed Lizards
- Uma exsul - Fringe-toed Sand Lizard
- Uma inornata - Coachella Valley Fringe-toed Lizard
- Uma notata - Colorado Desert Fringe-toed Lizard
- Uma paraphygas - Chihuahuan Fringe-toed Lizard
- Uma rufopunctata - Yuman Fringe-toed Lizard
- Uma scoparia - Mojave Fringe-toed Lizard
- Urosaurus - Tree & Bush Lizards
- Urosaurus auriculatus - Socorro Island Tree Lizard
- Urosaurus bicarinatus - Tropical Tree Lizard
- U. b. anonymorphus - Mittleman's Tree Lizard
- U. b. bicarinatus - Carinate Tree Lizard
- U. b. nelsoni - Nelson's Tree Lizard
- U. b. spinosus - Spiny Tree Lizard
- U. b. tuberculatus - Tubercular Tree Lizard
- Urosaurus clarionensis - Clarion Island Tree Lizard
- Urosaurus gadovi - Gadow's Tree Lizard
- Urosaurus graciosus - Long-tailed Brush Lizard
- U. g. graciosus - Western Long-tailed Brush Lizard
- U. g. shannoni - Arizona Long-tailed Brush Lizard
- Urosaurus irregularis - Mexican Brush Lizard
- Urosaurus lahtelai - Baja California Brush Lizard
- Urosaurus nigricaudus - Black-tailed Brush Lizard
- Urosaurus ornatus - Ornate Tree Lizard
- U. o. caeruleus - Blue Tree Lizard
- U. o. lateralis - Mexican Tree Lizard
- U. o. levis - Smooth Tree Lizard
- U. o. ornatus - Texas Tree Lizard
- U. o. schmidti - Big Bend Tree Lizard
- U. o. schottii - Schott's Tree Lizard
- U. o. symmetricus - Colorado River Tree Lizard
- U. o. wrighti - Northern Tree Lizard
- Uta - Side-blotched Lizards
- Uta antiqua - San Lorenzo Islands Lizard
- Uta encantadae - Enchanted Side-blotched Lizard
- Uta lowei - El Muerto Side-blotched Lizard
- Uta nolascensis - San Pedro Nolasco Side-blotched Lizard
- Uta palmeri - San Pedro Martir Side-blotched Lizard
- Uta squamata - Santa Catalina Side-blotched Lizard
- Uta stansburiana - Common Side-blotched Lizard
- U. s. elegans - Western Side-blotched Lizard
- U. s. nevadensis - Nevada Side-blotched Lizard
- U. s. stansburiana - Northern Side-blotched Lizard
- U. s. stejnegeri - Eastern Side-blotched Lizard
- U. s. taylori - Taylor's Side-blotched Lizard
- U. s. uniformis - Plateau Side-blotched Lizard
- Uta stellata - San Benito Island Lizard
- Uta tumidarostris - Swollen-nosed Side-blotched Lizard
- Varanus - Monitor Lizards
- Varanus niloticus - Nile Monitor
- Xantusia - Night Lizards
- Xantusia arizonae - Arizona Night Lizard
- Xantusia bezyi - Bezy's Night Lizard
- Xantusia bolsonae - Bolson Night Lizard
- Xantusia extorris - Durangan Night Lizard
- Xantusia gracilis - Sandstone Night Lizard
- Xantusia henshawi - Granite Night Lizard
- Xantusia riversiana - Island Night Lizard
- X. r. reticulata - San Clemente Night Lizard
- X. r. riversiana - San Nicolas Night Lizard
- Xantusia sanchezi - Sanchez's Night Lizard
- Xantusia sierrae - Sierra Night Lizard
- Xantusia vigilis - Desert Night Lizard
- X. v. gilberti - Baja California Night Lizard
- X. v. vigilis - Desert Night Lizard
- Xantusia wigginsi - Wiggins's Desert Night Lizard
- Xenosaurus - Mexican Knob-scaled Lizards
- Xenosaurus grandis - Knob-scaled Lizard
- X. g. agrenon - Mountain Know-scaled Lizard
- X. g. arboreus - Arboreal Knob-scaled Lizard
- X. g. grandis - Mexican Knob-scaled Lizard
- X. g. rackhami - Rackham's Knob-scaled Lizard
- X. g. sanmartinensis - San Martin Knob-scaled Lizard
- Xenosaurus newmanorum - Newman's Knob-scaled Lizard
- Xenosaurus penai - Pena's Knob-scaled Lizard
- Xenosaurus phalaroanthereon - Chin Spotted Knob-scaled Lizard
- Xenosaurus platyceps - Flathead Knob-scaled Lizard
- Xenosaurus rectocollaris - Pallid Knob-scaled Lizard
- Xenosaurus grandis - Knob-scaled Lizard