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-liigaJuha Ylönen (born 1972), former professional ice hockey centreLauri Ylönen (born 1979), the frontman of the Finnish alternative rock band, The RasmusPetri Ylönen (born 1962), Finnish born retired ice hockey goaltender who played in the French national ice hockey teamUrpo Ylönen (born 1943), goaltending coach and a retired professional ice hockey player who played in the SM-liigaVilho Ylönen (1918–2000), Finnish skier and sport shooter