| casanier | stay-at-home |
| casanière | stay-at-home |
| Casanova | Casanova |
| Casarano | Casarano |
| cascade | chute |
| Cascade de Gavarnie | Gavarnie Falls |
| Cascade de glace | Ice climbing |
| cascade de vapeur | smokefall |
| cascade de vapeur d'azote | smokefall |
| Cascade Locks | Cascade Locks |
| cascadeur | stuntman |
| cascadeuse | stuntwoman |
| Cascadia | Cascadia |
| Cascais | Cascais |
| cascarille | cascarilla |
| Cascia | Cascia |
| case | stall |
| case départ | square one |
| case à cocher | checkbox |
| casemate | blockhouse |
| caserne | barrack |
| Caserne de la Garde prétorienne | Castra Praetoria |
| Caserne de Moncada | Moncada Barracks |
| caserne de pompiers | fire station |
| Caserta | Caserta |
| Caserte | Caserta |
| Casey Dellacqua | Casey Dellacqua |
| Casey Donovan | Casey Donovan |
| cash and carry | cash-and-carry |
| cash-flow | cash flow |
| Cashmere | Kashmir |
| casi | almost |
| casier | slot |
