Riska is a surname. Notable people with the surname include:
Astrid Riska (1932–2010), Finnish organist Eddie Riska (1919–1992), American basketball player Erik Riska (born 1989), Finnish ice hockey player Filip Riska (born 1985), Finnish ice hockey player Kaj Riska (born 1953), Finnish naval architect and engineer
See also Martin Riška (born 1975), Slovak racing cyclist