Mohn is a surname. The word in German means "poppy". Notable people with the surname include:
Albert Henrik Mohn (1918–1999), Norwegian journalist
Bill Mohn (William Kirk Mohn) (1899–?), American football player
Ellef Mohn (1894–1974), Norwegian football player
Emanuel Mohn (1842–1891), Norwegian educator
Henrik Mohn (1835–1916), Norwegian astronomer and meteorologist
Jakob Mohn (1838–1882), Norwegian statistician
Leo Mohn (1925-1980), American politician
Lothar Mohn (born 1954), German choral conductor
Liz Mohn (born 1941), widow of Reinhard Mohn
Louise Mohn (born 1974), Norwegian entrepreneur
Per Mohn (born 1945), Norwegian politician
Petra Mohn (1911–1996), Norwegian politician
Reinhard Mohn (1921–2009), German businessman
Sigfrid Mohn (born 1930), Norwegian politician
Thorbjorn N. Mohn (1844–1899), American Lutheran church leader
Trond Mohn (born 1943), Norwegian businessperson and philanthropist
