Hydrops is a genus of snakes in the subfamily Dipsadinae of the family Colubridae.

The genus is endemic to South America.

[1] Three species are recognized as being valid.

[1][2] Nota bene: A binomial authority in parentheses indicates that the species was originally described in a genus other than Hydrops.

The specific name, martii, is in honor of German botanist Carl Friedrich Philipp von Martius.