| Abbreviation | Definition |
|---|---|
| ROT | Reign Of Terror |
| ROTA | Reinforcement of the Army |
| ROTA | Release Other Than Attack |
| ROTC | Reserve Officer Training Corps |
| ROTC | Reserve Officers' Training Corps |
| ROTHR | Relocatable Over-The-Horizon Backscatter Radar (USN) |
| ROTM | Rock Of The Marne |
| ROTP | Regular Officer Training Plan (Canada) |
| ROTP | Regular Officer Training Programme (Canada) |
| ROTP | Reserve Officers Training Program |
| ROTU | Reserve Officer Training Unit |
| ROV | Remotely Operated Vehicle |
| ROW | Realm Of Warcraft |
| ROW | Rest Of the World |
| ROWPU | Reverse Osmosis Water Purification Unit |
| ROZ | Restricted Operation Zone |
| RP | Radar Picket |
| RP | Rally Point |
| RP | Rapid Patch |
| RP | Rapid Production |