Kettunen is a Finnish surname, most prevalent in North Karelia. Notable people with the surname include:
Kettunen, a finnicized name of the family Alopaeus Eino Kettunen (1894–1964), Finnish composer Lauri Kettunen (1885–1963), Finnish linguist Lauri Kettunen (1905–1941), Finnish fencer and modern pentathlete Pauli Kettunen (born 1953), Finnish historian Outi Kettunen (born 1978), Finnish biathlete Elina Kettunen (born 1981), Finnish figure skater Tuomas Kettunen (born 1988), Finnish politician