Silvennoinen is a Finnish surname. Notable people with the surname include: Emmi Silvennoinen (born 1988), Finnish keyboard player Heikki Silvennoinen (born 1954), Finnish musician and actor Hemmo Silvennoinen (1932-2002), Finnish ski jumper Kaija Silvennoinen (born 1954), Finnish ski orienteering competitor Lauri Silvennoinen (1916-2004), Finnish cross-country skier Leena Silvennoinen (born 1958), Finnish orienteering competitor Mikko Silvennoinen, Finnish television host, journalist and producer Finnish-language surnames