| Acronym | Meaning |
 | QT | Quentin Tarantino - QuickTime - QuikTrip |
| QU | Quechua Language (ISO 639-1 Code) |
| QUANGO | (British Commonwealth) QUasi Autonomous Non-Governmental Organisation |
| QUASAR | Quasi-stellar Radio Source |
| QUE | Quechua Language (ISO 639-2 Code) |
| QUIET | Q And U Imaging ExperimenT (Q And U Are The Stokes Parameters Of The CMBR Polarization) |
| QV | Quod Vide (Latin Which See) |
| QVC | Quality |
| QWG | Quadripartite Working Group (qwig) |
| QWGAOR | Quadripartite Working Group On Army Operational Research (qwig-a-o-r) |
| QZ | Awair (IATA Airline Designator) |
| R | Reinforcing - Right -R?ntgen |
| R&B | Rhythm And Blues |
| R&D | Research & Development |
| R&R | Rest & Relaxation |
| R&S | Reconnaissance & Surveillance |
| R2I | Resistance To Interrogation |
| R3P | Rearm |
| RA | Radium |
| RA | Rain (METAR Code) -Rear Area - Reinforced Alert - Republican Army - Right Ascension - Royal Artillery (UK) - Royal Academy |
| RAA | Rear Assembly Area |
| RAAF | Royal Australian Air Force |
| RAC | Royal Automobile Club (in The United Kingdom |
| RACK | Risk Aware Consensual Kink (SM Phrase) |
| RACON | RAdar BeaCON |
| RADAR | RAdio Detection And Ranging |
| RADB | Real America Database - Resource Assessment Database - Reunion Address DataBase - Rice Allelopathy Data Base - Routing Arbiter Data Base |
| RADB | Routing Assets Data Base |
| RADB | Rad51/Dmc1 Homologous Protein |
| RADC | Region Air Defence Commander |
| RAE | UK Royal Aircraft Establishment (?1991) |
| RAF | Red Army Faction - Royal Air Force |
| RAG | Raising And Giving - Rocket Antitank Grenade |
| RAM | Random Access Memory - Rolling Airframe Missile - Royal Air Maroc |
| RAMARK | RAdar MARKer |
| RAOC | Rear Area Operation Centre |
| RAP | Radio Access Point - Radiological Assistance Program (U.S. Department Of Energy) - Rear Area Protection - Recognised [Operating/Operational] Air Picture - Recurring Advance Payment - Relational Associative Processor - Reliable Acoustic Path - Rocket-Assis |
| RARDE | UK Royal Armament Research And Development Establishment (1962?1991) |
| RATELO | Radiotelephone Operator |
| RB | Running Back (football) |
| RB | Rubidium |
| RBCI | Radio Based Combat Identification |
| RBI | Runs Batted In |
| RBOC | Regional Bell Operating Company (Baby Bell) |
| RC | See Entry |
| RCA | Radio Corporation Of America - Root Cause Analysis - Royal Canadian Artillery - Royal City Avenue (famous Entertainment Zone In Thailand) |
| RCAF | Royal Canadian Air Force |
| RCAR | Research Council For Automobile Repairs (are-car) |
| RCC | Rescue Co-ordination Centre |
| RCCO | Royal Canadian College Of Organists |
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