AJ
- A. J. (The Fairly OddParents)
- A.J. Soprano
- AAJ (disambiguation)
- AJ (given name)
- AJ Capital Partners
- AJ Institute of Engineering and Technology
- AJ and the Queen
- AJ's Fine Foods
- AJ+
- AJJ (disambiguation)
- Adherens junction
- Aj (newspaper)
- Ajay (disambiguation)
- Al Jazeera Arabic
- Animal Jam
- Animal Jam Classic
- Apollo Justice
- Architects' Journal
- Australian Scout Jamboree
- Azerbaijan
- Blaze and the Monster Machines
- Jaguar AJ-V8
- North American AJ Savage
- Schytts
- Starflyers
- The Astronomical Journal