JAC
- African Hockey Federation
- Castra of Jac
- Creaca
- F. P. Jac
- J.A.C.
- JAC (football club)
- JAC Liner
- JAC Motors
- JACS (disambiguation)
- JAX (disambiguation)
- Jac Arama
- Jac Holzman
- Jac Jagaciak
- Jac Morgan
- Jac Naylor
- Jac Nellemann
- Jac Rayner
- Jac Schaeffer
- Jac Venza
- Jac van Steen
- Jac. P. Thijsse
- Jacana railway station
- Jack (disambiguation)
- Jackson Hole Airport
- Jacobus van Looy
- Jacques Nasser
- Jakaltek language
- Japan Air Commuter
- Japanese Alpine Club
- Jewish Anti-Fascist Committee
- Jharkhand Academic Council
- John Abbott College
- John Jones (Jac Glan-y-gors)
- Joint Analysis Center
- Joint Astronomy Centre
- Journal of Ancient Civilizations
- Judicial Appointments Commission
- Junta de Aviación Civil
- Men's Hockey Junior Africa Cup
- Telangana Joint Action Committee
- The Jacaranda