- Jack Pina -- Jack Poels
- Jack Poles -- Jack Prelutsky
- Jack Prybylski -- Jack Quigly
- Jack Quinby -- Jack Radcliffe
- Jack Radicks -- Jack Ramsay
- Jack Ranelli -- Jack Reilly Trio
- Jack Reynolds -- Jack Roberts
- Jack Robinson -- Jack Ross
- Jack Roubik -- Jack Ruby And The Black Disciples
- Jack Ruby, Jr. -- Jack Russell
- Jack S. Margolis -- Jack Sausage
- Jack Savoretti -- Jack Schechtman
- Jack Schell -- Jack Sebastião
- Jack Sebastião -- Jack Shadow
- Jack Sharman -- Jack Sheldon & Terry Morel
- Jack Shilkret -- Jack Simmons
- Jack Simms -- Jack Skuller
- Jack Slam -- Jack Smith
- Jack Smith -- Jack Smith & Rockabilly Planet
- Jack Sneed -- Jack Sparrow
- Jack Sparrow -- Jack Stack a Track
- Jack Stafford -- Jack Starr's Burning Star
- Jack Starr's Burning Starr -- Jack Straw