Pietikäinen is a Finnish surname. Notable people with the surname include:
Aatto Pietikäinen (1921–1966), Finnish ski jumper Jukka Pietikäinen (born 1956), Finnish diplomat Matti Pietikäinen (1927–1967), Finnish ski jumper, brother of Aatto Matti Pietikäinen (academic), Finnish computer scientist Sirpa Pietikäinen (1959-), Finnish politician