Jack could refer to:
- Jack
- Jack Armstrong, the All-American Boy
- Jack Benny
- Jack Breshar
- Jack Butterworth
- Jack C. Haldeman II
- Jack Casden
- Jack Corrigan
- Jack Crusher
- jack cheese
- Jack Daniel's
- Jack DiAngelo
- Jack Elliott
- Jack Emmett
- Jack Frost
- Jack Gaynor
- Jack Gorvoy
- Jack Henderson
- Jack Katz
- Jack Kerr
- Jack London
- Jack Nesvig
- Jack Ousmanova
- Jack Pack
- Jack Ransom
- Jack Raymond
- Jack Somers
- Jack Torrance
- Jack the Ripper
- Jack White
- Jack Winslow
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