Ritzen is a surname. Notable people with the surname include:
Henri Ritzen (1892–1976), Dutch painter Jo Ritzen (born 1945), Dutch economist and social-democratic politician Peter Ritzen (born 1956), Flemish pianist composer and conductor Per-Erik Ritzén (born 1934), Swedish modern pentathlete Pierre Debray-Ritzen (1922–1993), French physician and psychiatrist