McIlwain is a surname. Notable people with the surname include:
- Alfie McIlwain (born 1998), English actor
 - Charles Howard McIlwain (1871–1968), American historian and political scientist
 - Dallas McIlwain (born 1982), Australian rugby league player
 - David McIlwain (1921–1981), English science fiction writer
 - Douglas McIlwain (born 1968), English local politician Mayor of Huntingdon
 - James McIlwain, American ophthalmologist
 - Stover McIlwain (1939–1966), American baseball player
 - Wally McIlwain (1903–1963), American football player
 - Zach McIlwain (born 1986), American national veterans advocate
 
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