Nguyenvansang's snake (Colubroelaps nguyenvansangi) is a species of snake in the subfamily Sibynophiinae of the family Colubridae. The species is endemic to Vietnam.
The specific name, nguyenvansangi, is in honor of Vietnamese herpetologist Nguyen Van Sang.
As of 2024, the genus Colubroelaps contains only one other species, Colubroelaps adleri.
Colubroelaps nguyenvansangi is found in southern Vietnam, in Bình Phðá»Âc Province and Lâm ÃÂá»Âng Province.
Colubroelaps nguyenvansangi may attain a total length of , which includes a tail about long. The head is small, roundish, and short, and is not distinct from the body. The body is very slender. The dorsal scales are in 15 rows at midbody. Dorsally, it is striped with brown and black. Ventrally, in striking contrast, it is uniform white.