Koivu is a Finnish surname meaning "birch". Notable people with the surname include:
Mikko Koivu (born 1983), Finnish professional ice hockey player, brother of Saku Rudolf Koivu (1890–1946), Finnish artist Saku Koivu (born 1974), retired Finnish professional ice hockey player, brother of Mikko
See also Kõiv, an Estonian surname of the same etymology Kõivu, an Estonian settlement Koivu mine, a titanium project in Finland