Singapore Reptiles

Class Reptilia

Crocodilians (Order Crocodylia)

Estuarine Crocodile (Crocodylus porosus)

Turtles and Tortoises (Order Testudines)

Sea Turtles
Green Turtle (Chelonia mydas)
Hawksbill Turtle (Eretmochelys imbricata)
Leatherback Turtle (Dermochelys coriacea)

Softshell Turtles
Asian Softshell Turtle (Amyda cartilaginea)
Forest Softshell Turtle (Dogania subplana)
Chinese Softshell Turtle (Pelodiscus sinensis) - Introduced

Native Terrapins
Malayan Box Terrapin (Cuora amboinensis)
Asian Leaf Terrapin (Cyclemys dentata)
Spiny Terrapin (Heosemys spinosa)
Malayan Flat-shelled Terrapin (Notochelys platynota)
Black Marsh Terrapin (Siebenrockiella crassicollis)

Introduced Turtles
Chinese Stripe-necked Turtle (Ocadia sinensis)
Malayan Giant Terrapin (Orlitia borneensis)
Giant Leaf Terrapin (Heosemys grandis)
Asian Forest Tortoise (Manouria emys)
Common Snapping Turtle (Chelydra serpentina)
North Antillean Slider (Trachemys decussata)
Red-eared Slider (Trachemys scripta)
Razorback Musk Turtle (Sternotherus carinatum)
Fly River Turtle (Carettochelys insculpta)
Indian Star Tortoise (Geochelone elegans)

Lizards and Snakes (Order Squamata)

Lizards (Suborder Lacertilia)

Geckos
Fox-faced Gecko (Aeluroscalabotes felinus)
Peninsular Rock Gecko (Cnemaspis peninsularis)
Frilly Gecko (Cosymbotes craspedotus)
Flat-tailed Gecko (Cosymbotes platyurus)
Peter's Bent-toed Gecko (Cyrtodactylus consobrinus)
Singapore Bent-toed Gecko (Cyrtodactylus majulah)
Marbled Bent-toed Gecko (Cyrtodactylus quadrivirgatus)
Peninsular Bent-toed Gecko (Cyrtodactylus semenanjungensis)
Four-clawed Gecko (Gehyra mutilata)
Tokay Gecko (Gekko gecko)
Spotted House Gecko (Gekko monarchus)
Large Forest Gecko (Gekko smithii)
Brooke's House Gecko (Hemidactylus brookii)
Common House Gecko (Hemidactylus frenatus)
Indo-Pacific Gecko (Hemidactylus garnotii)
Dwarf Gecko (Hemiphyllodactylus typus)
Mourning Gecko (Lepidodactylus lugubris)
Brown's Flap-legged Gecko (Luperosaurus browni)
Horsfield's Flying Gecko (Ptychozoon horsfieldii)
Kuhl's Flying Gecko (Ptychozoon kuhli)

Agamids
Earless Agamid (Aphaniotis fusca)
Green Crested Lizard (Bronchocela cristatella)
Changeable Lizard (Calotes versicolor) - Introduced
Black-bearded Flying Lizard (Draco melanopogon)
Five-banded Flying Lizard (Draco quinquefasciatus)
Common Flying Lizard (Draco sumatranus)

Skinks
Brown Tree Skink (Dasia grisea)
Olive Tree Skink (Dasia olivacea)
Striped Tree Skink (Lipinia vittigera)
Mangrove Skink (Emoia atrocostata)
Common Sun Skink (Eutropis multifasciata)
Striped Sun Skink (Eutropis rugifera)
Garden Supple Skink (Lygosoma bowringii)
Singapore Swamp Skink (Tytthoscincus temasekensis)

Monitors
Clouded Monitor (Varanus bengalensis)
Dumeril's Monitor (Varanus dumerili)
Malayan Water Monitor (Varanus salvator)

Snakes (Suborder Serpentes)

Banded File Snake (Acrochordus granulatus)
Red-tailed Pipe Snake (Cylindrophis ruffus)
Reticulated Python (Broghammerus reticulatus)
Sunbeam Snake (Xenopeltis unicolor)
Speckle-headed Whip Snake (Ahaetulla fasciolata)
Malayan Whip Snake (Ahaetula mycterizans)
Oriental Whip Snake (Ahaetulla prasina)
Keel-bellied Whip Snake (Dryophiops rubescens)
Dog-toothed Cat Snake (Boiga cynodon)
Mangrove Snake (Boiga dendrophila)
White-spotted Cat Snake (Boiga drapiezii)
Jasper Cat Snake (Boiga jaspidea)
Variable Reed Snake (Calamaria lumbricoidea)
Pink-headed Reed Snake (Calamaria schlegeli)
Paradise Tree Snake (Chrysopelea paradisi)
Twin-barred Tree Snake (Chrysopelea pelias)
Common Malayan Racer (Coelognathus flavolineatus)
Copperhead Racer (Coelognathus radiatus)
Striped Bronzeback (Dendrelaphis caudolineatus)
Blue Bronzeback (Dendrelaphis cyanochloris)
Elegant Bronzeback (Dendrelaphis formosus)
Haas' Bronzeback (Dendrelaphis haasi)
Red-necked Bronzeback (Dendrelaphis kopsteini)
Painted Bronzeback (Dendrelaphis pictus)
Malayan Bridle Snake (Dryocalamus subannulatus)
Orange-bellied Ringneck (Gongylosoma baliodeira)
Red-tailed Racer (Gonyosoma oxycephalum)
Tricoloured Ringneck (Liopeltis tricolor)
House Wolf Snake (Lycodon capucinus)
Banded Wolf Snake (Lycodon subcinctus)
Brown Kukri Snake (Oligodon purpurascens)
Striped Kukri Snake (Oligodon octolineatus)
Barred Kukri Snake (Oligodon signatus)
Dwarf Reed Snake (Pseudorabdion longiceps)
Keeled Rat Snake (Ptyas carinata)
White-bellied Rat Snake (Ptyas fusca)
Indochinese Rat Snake (Ptyas korros)
Black-headed Collared Snake (Sibynophis melanocephalus)
Malayan Brown Snake (Xenelaphis hexagonotus)
Cantor's Water Snake (Cantoria violacea)
Dog-faced Water Snake (Cerberus rynchops)
Rainbow Water Snake (Enhydris enhydris)
Crab-eating Water Snake (Fordonia leucobalia)
Yellow-lipped Water Snake (Gerarda prevostiana)
Puff-faced Water Snake (Homalopsis buccata)
Blackwater Mud Snake (Phytolopsis punctata)
Blue-necked Keelback (Macropisthodon rhodomelas)
Painted Mock Viper (Psammodynastes pictus)
Southern Chequered Keelback (Xenochrophis flavipunctatus)
Spotted Keelback (Xenochrophis maculatus)
Triangle Keelback (Xenochrophis trianguligerus)
Striped Keelback (Xenochrophis vittatus) - Introduced
White-spotted Slug Snake (Pareas margaritophorus)
Malayan Krait (Bungarus candidus)
Banded Krait (Bungarus fasciatus)
Blue Malayan Coral Snake (Calliophis bivirgatus)
Banded Malayan Coral Snake (Calliophis intestinalis)
Equatorial Spitting Cobra (Naja sumatrana)
King Cobra (Ophiophagus hannah)
Yellow-lipped Sea Krait (Laticauda colubrina)
Horned Sea Snake (Acalyptophis peronii)
Marbled Sea Snake (Aipysurus eydouxii)
Stoke's Sea Snake (Astrotia stokesii)
Beaked Sea Snake (Enhydrina schistosa)
Blue-banded Sea Snake (Hydrophis cyanocinctus)
Striped Sea Snake (Hydrophis fasciatus)
Kloss' Sea Snake (Hydrophis klossi)
Short Sea Snake (Lapemis curtus)
Small-headed Sea Snake (Microcephalophis gracilis)
Yellow-bellied Sea Snake (Pelamis platurus)
Mangrove Pit Viper (Cryptelytrops purpureomaculatus)
Wagler's Pit Viper (Tropidolaemus wagleri)
Brahminy Blind Snake (Indotyphlops braminus)
White-bellied Blind Snake (Argyrophis muelleri)

References

https://www.nparks.gov.sg/biodiversity/wildlife-in-singapore/species-list/reptile
http://www.wildsingapore.per.sg/discovery/animalaz.htm
https://www.ecologyasia.com/
https://singaporesnakes.blogspot.com/
http://www.chelonia.org/byspecies.htm