KAC may refer to:
- Knight's Armament Company
- EC KAC, a professional ice hockey team
- Kajonk-A-Con
- King Armored Car, the USA's first armored vehicle.
- Kosciuszko Alpine Club (KAC), an organisation which operates accommodation and organises recreational activities in Kosciuszko National Park, Australia.
- Kuwait Airways Corporation
- The Kenyon Athletic Center, an athletic center at Kenyon College, Ohio
- A Romanian football club Ferar Cluj-Napoca.