黑藻属（学名：Hydrilla）是水鳖科下的一个属，为沉水草本植物。该属仅有黑藻（Hydrilla verticillata）一种，分布于东半球。

Hydrilla (Esthwaite Waterweed, waterthyme or hydrilla) is a genus of aquatic plant, usually treated as containing just one species, Hydrilla verticillata, though some botanists divide it into several species. It is native to the cool and warm waters of the Old World in Asia, Europe, Africa and Australia, with a sparse, scattered distribution; in Europe, it is reported from Ireland, Great Britain, Germany, and the Baltic States, and in Australia from Northern Territory, Queensland, and New South Wales.