Bathymaster is a genus of marine ray-finned fishes belonging to the family Bathymasteridae, the ronquils.

Bathymaster was first proposed as a monotypic genus in 1873 by the American paleontologist and biologist Edward Drinker Cope when he described its type species Bathymaster signatus from Sitka, Alaska.

[1][2] The genus is classified in the family Bathymasteridae which is in the Scorpaeniform suborder Zoarcoidei.

[3] The genus name, Bathymaster, can be translated from the Greek to mean "deep searcher".

[6] The largest species is B. signatus with a maximum published total length of 38 cm (15 in) while the smallest is B. derjugini which has a maximum published total length of 18 cm (7.1 in).