- Jack Finney
- Jack Gould
- Jack Hanna
- Jack Hannah
- Jack Henry Abbott
- Jack Herer
- Jack Higgins
- Jack Irons
- jack jak
- Jack Johnson
- Jack K Cooke
- Jack Kelley
- Jack Kemp
- Jack Kent Cooke
- Jack Ketch
- Jack Kevorkian
- Jack Kilby
- Jack Kingston
- Jack Kirby
- Jack Klugman
- Jack Kroll
- Jack L Chalker
- Jack L Warner
- Jack LaLanne
- Jack Layton
- Jack Lemon
- Jack Levine
- Jack Lord
- Jack Lovelock
- Jack Miller
- Jack Nance
- Jack Nicholson
- Jack Osbourne
- Jack Paar
- Jack Prelutsky
- Jack Reed
- Jack Ruby
- Jack Scalia
- Jack Schmitt
- Jack Schwartz