Mac Eoin, MacEoin or McEoin is an Irish surname. Notable people with the surname include:
Denis MacEoin (born 1949), Irish editor Gearóid Mac Eoin (born 1929), Irish academic Seán Mac Eoin (1893–1973), Irish politician Tomás Mac Eoin (born 1937), Irish singer Owen MacEoin Dubh MacAlister (?–1571), Chief of Clan MacAlister Athairne Mac Eoghain (1200–1600), Irish poet
See also Mac Eoin Bissett family