Hypsiscopus matannensis is a species of water snake in the order Squamata.

[1] The species epithet refers to its type locality, Lake Matana (also spelled Matano), in Sulawesi.

[2][3] Its common names are Matana mud or water snake,[3][4][5] which also reflects its type locality, and Boulenger's water snake.

[6] The species was first described in 1897 by the zoologist George Albert Boulenger.

It is endemic to Southeast Sulawesi (the Celebes).