Ruohonen is a Finnish surname. Notable people with the surname include:
Ilkka Ruohonen (1958–2016), Finnish cultural anthropologist and documentary filmmaker Laura Ruohonen (born 1960), Finnish playwright and theatre director Rich Ruohonen (born 1971), American curler Seppo Ruohonen (1946–2020), Finnish opera singer Matti ja Teppo Ruohonen, Finnish pop singer duo
See also Pirkko Ruohonen-Lerner (born 1957), Finnish politician