| Q1 | First Quarter | - | Astronomy |
| Q2 | Second Quarter | - | Astronomy |
| Q3 | Third Quarter | - | Astronomy |
| Q4 | Fourth Quarter | - | Astronomy |
| QA | Qatar (FIPS 10-4 Country Code; ISO 3166 Digram) | - | Astronomy |
| QANTAS | Queensland And Northern Territory Aerial Services | - | Astronomy |
| QAP | Quadripartite Advisory Publication (kwapp) | - | Astronomy |
| QAR | Qatari Rial (ISO 4217 Currency Code) | - | Astronomy |
| QAT | Qatar (ISO 3166 Trigram) | - | Astronomy |
| QB | Quarterback (football) | - | Astronomy |
| QC | Quality Control -Qu?bec (postal Symbol) -Queen's Counsel | - | Astronomy |
| QCA | Qualifications And Curriculum Authority - Quality Council Of Alberta | - | Astronomy |
| QCD | Quantum ChromoDynamics | - | Astronomy |
| QD | Quaque Die (Latin | - | Astronomy |
| QDOS | Quick And Dirty Operating System (cue-doss) | - | Astronomy |
| QDR | Quadrennial Defense Review | - | Astronomy |
| QED | Quantum Electrodynamics -quid Es Demonstrata Or Quod Erat Demonstrandum (Latin | - | Astronomy |
| QEH | Queen Elizabeth's Hospital | - | Astronomy |
| QFE | Quoted For Emphasis -Local Ground Level Atmospheric Pressure (aeronautical Q Code) | - | Astronomy |
| QID | Quater In Die (Latin | - | Astronomy |
| QIP | Quadrilateral Interoperability Programme (ancestor Of MIP; Quip) | - | Astronomy |
| QK | Air Canada Jazz (IATA Airline Designator) | - | Astronomy |
| QLD | Queensland | - | Astronomy |
| QM | Quality Management - Quantum Mechanics - Queen Mother | - | Astronomy |
| QNH | Regional Mean Sea Level Atmospheric Pressure (aeronautical Q Code) | - | Astronomy |
| QPR | Queens Park Rangers (English Football Team) | - | Astronomy |
| QPS | Quark Publishing System | - | Astronomy |
| QR | Quake Rally - Qualitative Reasoning - Queensland Rail - Queen's Rangers - Quick Release - Quiet Riot -Qatar Airways (IATA Airline Designator) | - | Astronomy |
| QS | Quantum Sufficit (Latin | - | Astronomy |
| QSCAT | Quick Scatterometer Satellite | - | Astronomy |
| QSL | Qu?bec Sign Language | - | Astronomy |
| QSO | Quasi-Stellar Object | - | Astronomy |
| QSTAG | Quadripartite Standardization Agreement (cue-stag) | - | Astronomy |
| QT | Quentin Tarantino - QuickTime - QuikTrip | - | Astronomy |
| QU | Quechua Language (ISO 639-1 Code) | - | Astronomy |
| QUANGO | (British Commonwealth) QUasi Autonomous Non-Governmental Organisation | - | Astronomy |
| QUASAR | Quasi-stellar Radio Source | - | Astronomy |
| QUE | Quechua Language (ISO 639-2 Code) | - | Astronomy |
| QUIET | Q And U Imaging ExperimenT (Q And U Are The Stokes Parameters Of The CMBR Polarization) | - | Astronomy |
| QV | Quod Vide (Latin Which See) | - | Astronomy |
| QVC | Quality | - | Astronomy |
| QWG | Quadripartite Working Group (qwig) | - | Astronomy |
| QWGAOR | Quadripartite Working Group On Army Operational Research (qwig-a-o-r) | - | Astronomy |
| QZ | Awair (IATA Airline Designator) | - | Astronomy |
