Hynninen is a Finnish surname. Notable people with the surname include:
Eero Hynninen (born 1953), Finnish sprint canoeist Helka Hynninen (1930–2017), Finnish singer and songwriter Jorma Hynninen (born 1941), Finnish opera singer Onni Hynninen (1910–2001), Finnish sport shooter Paavo Hynninen (1883–1960), Finnish diplomat