McMullan is a Gaelic surname. Notable people with the surname include:
Bob McMullan, Australian politicianDavid McMullan (b. 1901), Irish footballer (Liverpool FC)Jackie McMullan, Provisional Irish Republican Army memberJim McMullan, actorJimmy McMullan, Scottish soccer playerLyle McMullan, editor and newspaper founderKevin McMullan, acoustic guitaristPaul McMullan (footballer, born 1984), Scottish footballer (Heart of Midlothian FC)Paul McMullan (footballer, born 1996), Scottish footballer (Celtic FC)Paul McMullan (journalist) (b. 1963)