| Club Sportif Louhans-Cuiseaux | CS Louhans-Cuiseaux |
| Club Sportif Sedan Ardennes | CS Sedan Ardennes |
| Club sportif sfaxien | Club Sportif Sfaxien |
| Club Sportivo Ben Hur | Club Sportivo Ben Hur |
| Club Sportivo Cerrito | Club Sportivo Cerrito |
| Club Sportivo Desamparados | Sportivo Desamparados |
| Club Sportivo Independiente Rivadavia | Club Sportivo Independiente Rivadavia |
| Club Sportivo Italiano | Sportivo Italiano |
| Club Sportivo Miramar Misiones | Miramar Misiones |
| Club Sportivo Patria | Sportivo Patria |
| Club Toluca | Club Deportivo Toluca |
| Club Valencia | Club Valencia |
| Club Villa Mitre | Club Villa Mitre |
| Clube Atlético Bragantino | Clube Atlético Bragantino |
| Clube Atlético Juventus | Clube Atlético Juventus |
| Clube Atlético Mineiro | Clube Atlético Mineiro |
| Clube Atlético Paranaense | Clube Atlético Paranaense |
| Clube de Desportos Costa do Sol | Clube de Desportos da Costa do Sol |
| Clube de Regatas Brasil | Clube de Regatas Brasil |
| Clube de Regatas do Flamengo | Clube de Regatas do Flamengo |
| Clube Desportivo Primeiro de Agosto | Clube Desportivo Primeiro de Agosto |
| Clube do Remo | Clube do Remo |
| Clube Náutico Capibaribe | Clube Náutico Capibaribe |
| Clubionidae | Sac spider |
| Cluedo | Cluedo |
| Clugin | Clugin |
| Cluj-Napoca | Cluj-Napoca |
| Cluny | Cluny |
| Cluny - La Sorbonne | Cluny - La Sorbonne |
| Clupea | Herring |
| Clupeidae | Clupeidae |
| Clupeiformes | Clupeiformes |
| Cluses | Cluses |
| Clusiaceae | Clusiaceae |
| Clusiacée | Clusiaceae |
| clusiacées | clusiacea |
| clusie | balsam-tree |
| Clusone | Clusone |
| Cluster | Cluster |
| Cluster Beowulf | Beowulf |
| Cluster of differentiation | Cluster of differentiation |
| Clwyd | Clwyd |
| CLX | Component Library for Cross Platform |
| Clyde | River Clyde |
| Clyde William Tombaugh | Clyde Tombaugh |
| Clydesdale | Clydesdale |
| Clymène | Clymene |
| Clysterophilie | Klismaphilia |
| Clytemnestre | Clytemnestra |
| Clythios | Clytius |
| Clytia | Clytie |
| Cláudio Ibrahim Vaz Leal | Cláudio Ibrahim Vaz Leal |
| Cláudio Taffarel | Cláudio Taffarel |
| Clèves | Kleve |
| clé | wrench |
| clé Allen | Allen key |
| clé anglaise | wrench |
| Clé berlinoise | The Berlin key |
| Clé de chiffrement | Key |
| clé de fa | bass clef |
| clé de serrage | spanner |
| clé de sol | treble clef |
| Clé de verrou | Latch key |
| Clé double | Double ended wrench |
| clé en main | turnkey |
| Clé faible | Weak key |
| Clé grecque | Greek key |
| Clé primaire | Unique key |
| Clé publique | Public key |
| Clé Torx | Torx |
| clé universelle | wrench |
| clé USB | flash drive |
| clé à douille | socket wrench |
| clé à molette | wrench |
| Clé à pipe | Allen wrench |
| Clé à écrou | Nut spanner |
| clé à écrous | wrench |
| clé électronique | dongle |
| clé étrangère | foreign key |
| Cléanthe | Cleanthes |
| Cléarque | Clearchus of Sparta |
| Cléarque de Soles | Clearchus of Soli |
