Stygobromus kenki is a rare species of amphipod, a crustacean. Its common names include Kenk's amphipod, Rock Creek groundwater amphipod, and Rock Creek stygobromid. This species lives only in Washington, D.C., and Montgomery County, Maryland, in the United States. It can be found only in the Potomac River watershed. Its entire range is less than 40 square miles. It has only been found at five sites at springs or seeps in the local waterways. The species lives in and near water in freshwater habitat. It can be found in detritus and sediment along springs and seeps.