Saastamoinen is a Finnish surname. Notable people with the surname include:
*
Armas Saastamoinen (1886–1946), Finnish businessman
*
Eino Saastamoinen (1887–1946), Finnish gymnast
*
Yrjö Saastamoinen (1888–1966), Finnish diplomat and CEO
*
Jarmo Saastamoinen (born 1967), Finnish football player
{{surname
Finnish-language surnames