| Acronym | Definition |
|---|
| AJ | Air Jordan (shoe) |
| AJ | Applejack (My Little Pony character) |
| AJ | Armani Jeans |
| AJ | Animal Jam (online educational playground) |
| AJ | Angelina Jolie (actress) |
| AJ | Astronomical Journal |
| AJ | Anti-Jam |
| AJ | Andrew Jackson (7th US President) |
| AJ | Administrative Judge |
| AJ | Al-Jazeera (Middle East TV Network) |
| AJ | Aide Juridictionnelle (French: Legal Aid) |
| AJ | Awesome Job |
| AJ | Apple Juice |
| AJ | Air Jamaica (airline) |
| AJ | Ask Jeeves |
| AJ | Anti-Jamming |
| AJ | Audax Japan |
| AJ | Amber Jack |
| AJ | Aunt Jemima |
| AJ | Allen Jones (wrestler) |
| AJ | Albert James (Foyt) |
| AJ | Articulation Joint |
| AJ | Albuquerque Journal (newspaper) |
| AJ | Arabtech Jardaneh (various locations) |
| AJ | Atari Jaguar |
| AJ | Anup Jalota (Indian singer) |
| AJ | Ankle Jerk |
| AJ | Alexander James McLean (Backstreet Boys) |
| AJ | Adjustable Spanner (British; wrench) |
| AJ | Association de La Jeunesse (French youth soccer) |
| AJ | Apostles of Jesus (Religious) |
| AJ | Assembly Jig |
| AJ | Apricot Juice |
| AJ | Auberge Jeunesse (French: youth hostel) |
| AJ | Alpinisme Juvénile (French mountaineering group) |
| AJ | Acting Jack (Acting Sergeant; Army) |
| AJ | Arrow Jazz (radio channel) |
| AJ | Active Jamming |
| AJ | Azerbaydzhan |
| AJ | Albergue Juvenil José Gilberto Flores Vides (Jose Gilberto Vides Flores Youth Lodge, Guatemala) |
| AJ | Alberta Judgements (Canada) |