Ylönen is a surname. Notable people with the surname include:
Antti Ylönen (born 1983), Finnish ice hockey defenceman currently playing for Kärpät of the SM-liiga
Juha Ylönen (born 1972), former professional ice hockey centre
Lauri Ylönen (born 1979), the frontman of the Finnish alternative rock band, The Rasmus
Petri Ylönen (born 1962), Finnish born retired ice hockey goaltender who played in the French national ice hockey team
Urpo Ylönen (born 1943), goaltending coach and a retired professional ice hockey player who played in the SM-liiga
Vilho Ylönen (1918–2000), Finnish skier and sport shooter
