| Acronym | Definition |
|---|
| RJA | Red Jumpsuit Apparatus (band) |
| RJA | Royal Jordanian Airlines (ICAO code) |
| RJA | Raymond James & Associates (St. Petersburg, FL) |
| RJA | Rolf Jensen & Associates |
| RJA | Russell Johns Associates, LLC (advertising agency; Clearwater, FL) |
| RJA | Rules of Judicial Administration |
| RJA | Rochester Japanese Association (Rochester, NY) |
| RJA | Roy Jorgensen Associates, Inc. (Maryland and California) |
| RJA | Royale Jeunesse Aischoise (French; Belgian soccer association) |
| RJA | US Revenue Narcotic Tax (Scott Catalogue prefix; philately) |
| RJA | Rebuffatti Jonathan Assistance Informatique (French: Jonathan Rebuffatti Computer Support; Belgium) |
| RJA | Repetitive Join Attempt (Unreal game engine security exploit) |