McMillin is a surname. Notable people with the surname include:
Benton McMillin (1845–1943), Governor of Tennessee Bo McMillin (1895–1952), American football coach Challace McMillin (1942–2020), American football coach at James Madison University Corky McMillin (1929–2005), American racer David McMillin (born 1984), American singer George McMillin (1889–1983), 38th and final Naval Governor of Guam James McMillin (1914–2005), American Olympic rower John Ernest McMillin (1884–1949), member of the Canadian House of Commons John S. McMillin (1855–1936), American lawyer and businessman Judson McMillin (born 1977), member of the Indiana House of Representatives Marie McMillin (born 1902), American aviator
See also Crocker-McMillin Mansion-Immaculate Conception Seminary, National Register of Historic Places site in New Jersey McMillin Bridge, bridge in Washington state McMillin Observatory, observatory in Ohio Johnson–McMillin syndrome, syndrome causing hearing loss