Heikkinen is a surname originating in Finland, where it is the eighth most common surname. It may also refer to, alphabetically:
Aki Heikkinen (born 1980), Finnish decathlete
Frans Heikkinen (1906–1943), Finnish cross country skier
Henna Heikkinen (born 1988), Finnish singer from Idols Finland 2
Ilkka Heikkinen (born 1984), Finnish ice hockey player
Janne Heikkinen (born 1976), Finnish volleyball player
Jussi Heikkinen (born 1988), Finnish football (soccer) player
Kasperi Heikkinen (born 1980), guitar player, member of Amberian Dawn
Markus Heikkinen (born 1978), Finnish footballer
Matti Heikkinen (born 1983), Finnish cross country skier
Mikko Heikkinen (born 1949), Finnish architect
Ralph Heikkinen (1917–1990), U.S. football player
And also:
Heikkinen – Komonen Architects (est. 1974), Finnish architectural firm