| Quad eXtended Graphics Array | QXGA |
| Quad Flat Package | QFP |
| Quad Ultra eXtended Graphics Array | QXGA |
| Quades | Quadi |
| Quadragesimo Anno | Quadragesimo Anno |
| quadragénaire | quadragenarian |
| quadrangulaire | quadrangular |
| quadrant | quadrant |
| Quadrant Alpha | Galactic quadrant |
| Quadrantides | Quadrantids |
| Quadratique | Square |
| Quadratura | Quadratura |
| Quadrature du carré | Squaring the square |
| Quadrature phase-shift keying | Phase-shift keying |
| Quadrichromie | CMYK color model |
| quadriennal | quadrennial |
| Quadrifolié | Four leaved |
| quadrijumeaux | quadruplets |
| quadrilatère | quadrangle |
| quadrilatéral | quadrilateral |
| quadrille | quadrille |
| quadrillé | checked |
| quadrimoteur | four-engined |
