Thamnosophis lateralis

{{Short description|Species of snake}}

{{Speciesbox

| image = Lateral_Water_Snake_(Thamnosophis_lateralis)_(9598851968).jpg

| image_caption =

| status = LC

| status_system = IUCN3.1

| status_ref = {{cite journal | title = Thamnosophis lateralis | journal = IUCN Red List of Threatened Species | volume= 2011 | year = 2011 | doi = 10.2305/IUCN.UK.2011-2.RLTS.T172818A6923828.en | doi-access = free }}

| genus = Thamnosophis

| species = lateralis

| authority = (Duméril, Bibron & Duméril, 1854)

| synonyms = * Leptophis lateralis Duméril, Bibron & Duméril, 1854

• Dromicus madagascariensis Günther, 1872
• Dromicus baroni Boulenger, 1888
• Liopholidophis lateralis (Duméril, Bibron & Duméril, 1854)

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}}

Thamnosophis lateralis, commonly known as the lateral water snake, is a species of snake in the family Pseudoxyrhophiidae. It is endemic to Madagascar.