McMullan is a Gaelic surname. Notable people with the surname include:
Bob McMullan, Australian politician
David McMullan (b. 1901), Irish footballer (Liverpool FC)
Jackie McMullan, Provisional Irish Republican Army member
Jim McMullan, actor
Jimmy McMullan, Scottish soccer player
Lyle McMullan, editor and newspaper founder
Kevin McMullan, acoustic guitarist
Paul McMullan (footballer, born 1984), Scottish footballer (Heart of Midlothian FC)
Paul McMullan (footballer, born 1996), Scottish footballer (Celtic FC)
Paul McMullan (journalist) (b. 1963)
