| Acronym | Definition |
|---|
| RJ | Restorative Justice |
| RJ | Registered Jack (e.g. RJ-11, RJ-13, RJ-45, modular wiring) |
| RJ | Rio de Janeiro (Brazil) |
| RJ | Reform Judaism |
| RJ | Raymond James (investment firm; various locations) |
| RJ | Review Journal |
| RJ | Regional Jet |
| RJ | Richard Jefferson (basketball player) |
| RJ | Radio Jockey (radio announcer) |
| RJ | Robert Jordan (American author of Wheel of Time series) |
| RJ | Radio Japan (online radio) |
| RJ | Ron Jeremy (adult film actor) |
| RJ | Ring Joint |
| RJ | Random Jitter |
| RJ | Royal Jordanian Airline (IATA airline code) |
| RJ | Road Junction |
| RJ | Ragga Jungle (music genre) |
| RJ | RIVET JOINT |
| RJ | Rocket Jump |
| RJ | Radar Jammer |
| RJ | Raspberry Juice |
| RJ | US Revenue Tobacco Sale (Scott Catalogue prefix; philately) |