| Quadratdezimeter | square decimetre |
| Quadratzentimeter | square centimeter |
| Quadratkilometer | square kilometre |
| Quadratmeter | square meter square metre |
| Quadratmillimeter | square millimeter square millimetre |
| Quadratmikrometer | square micrometer square micrometre |
| Quadratmeile | square mile |
| Quartiermeister | quartermaster |
| Quadragesima | Lent |
| Quadratestadt | City of Squares |
| Quadratsekunde | second |
| Dezimeter | decimeter decimetre |
| Wartezimmer | waiting room |
| Quadrieren | quadrature |
| quadrieren | square |
| Quadriplegie | quadriplegia |
| Quadrocopter | quadcopter |
| Quadrokopter | quadcopter |
| Quadrupeder | quadruped |
| quartieren | quarter |