Nousiainen is a Finnish surname. Notable people with the surname include:
Heikki Nousiainen (born 1945), Finnish actor Mikko Nousiainen (born 1975), Finnish actor Mona-Liisa Nousiainen (1983–2019), Finnish cross country skier Viljo Nousiainen (1944–1999), Sweden Finn athletics coach Ville Nousiainen (born 1983), Finnish cross-country skier