Riisnæs is a surname. Notable people with the surname include:
Anne Eline Riisnæs (born 1951), Norwegian pianist and piano pedagog Dag Riisnæs (born 1969), Norwegian footballer Eline Nygaard Riisnæs (1913–2011), Norwegian pianist and musicologist Knut Riisnæs (born 1945), Norwegian musician, arranger, and composer Odd Riisnæs (born 1953), Norwegian musician and composer Sverre Riisnæs (1897–1988), Norwegian jurist, public prosecutor, and Nazi collaborator