Frerichs is a surname. It may refer to:
Courtney Frerichs (born 1993), American middle-distance runner specializing in steeplechase Dieter Frerichs, director for two of the K1 funds a British Virgin Islands based hedge fund that collapsed Don Frerichs (1931–2019), American businessman and politician Friedrich Theodor von Frerichs (1819–1885), German pathologist Gerret Frerichs, German record producer of the trance group/solo project Humate Jan Frerichs (born 1973), German theologian, author and spiritual teacher Jason Frerichs (born 1984), American politician, state senator from South Dakota Mark Frerichs (born 1962), American civil engineer and former US Navy diver who disappeared in Afghanistan Mike Frerichs (born 1973), American politician, State Treasurer of Illinois Ralph R. Frerichs (born 1942), American epidemiologist Rembrandt Frerichs (born 1977), Dutch pianist and composer