Hydaticus is a genus of predatory water beetle belonging to the family Dytiscidae.

Hydaticus can be found throughout most of the world.

There are 150 described species and 12 subspecies in two subgenera in the genus Hydaticus.

[1][2] These seven species are in the subgenus Hydaticus: These 143 species are in the subgenus Prodaticus: