McMullin is a surname. Notable people with the surname include:
Alister McMullin (1900–1984), Australian politician Dale McMullin (born 1955), Canadian ice hockey player David McMullin (1908–1995), American field hockey player Ernan McMullin, professor at the University of Notre Dame Evan McMullin, (born 1976), candidate for President of the United States in the 2016 presidential election Fred McMullin (1891–1952), American baseball player Ian McMullin (born 1964), Australian rules footballer Keith B. McMullin (born 1941), Latter Day Saints bishop Peter McMullin (born 1952), Australian politician R. Troy McMullin, Canadian lichenologist