Hydrus is a small constellation in the southern sky.
Hydrus may also refer to: Hydrus (Chinese astronomy), constellations recognized in China Hydrus (legendary creature), a creature from Medieval bestiaries Hydrus (roller coaster), a Gerstlauer Euro-Fighter roller coaster at Casino Pier Hydrus (software), a software suite for simulating subsurface water flow SS Hydrus (1903), a Great Lakes freighter The 7th Colossus from Shadow of the Colossus Hydrus, the ancient name of Otranto
See also Hydros (disambiguation)