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Jack Douglas may refer to:
- Jack Douglas (actor) (1927–2008), British actor and comedian
- Jack Douglas (footballer, born 1872) (1872–1905), Australian rules footballer
- Jack Douglas (footballer, born 1929) (1929–2007), Australian rules footballer
- Jack Douglas (ice hockey) (1930–2003), Canadian ice hockey player
- Jack Douglas (record producer), American record producer
- Jack Douglas (writer) (1908–1989), American comedy writer
- Jon Douglas, known as Jack, American tennis player and college football quarterback
- Jack Douglas (television host) (1921–1994), television host and producer