Törmänen is a Finnish surname. Notable people with the surname include:
Veikko Törmänen (born 1945), Finnish artist Jouko Törmänen (1954–2013), Finnish ski jumper Antti Törmänen (born 1970), Finnish professional ice hockey player Antti Törmänen (Go player) (born 1989), Finnish professional Go player Rosa Törmänen (born 1992), Finnish racing cyclist