| CUSTOM CHROME | MOTOCICLETA | USA | MORGAN HILL - CALIFORNIA | 1970 |
| CWS (Birmingham) | TRICAR | REINO UNIDO | BIRMINGHAM - WARWICKSHIRE | 1922 |
| CWS (Warszawa) | MOTOCICLETA | POLONIA | WARSZAWA - WOJEWÓDZTWO MAZOWIECKIE | 1922 |
| CYC-AUTO | AUTOCICLO | REINO UNIDO | LONDON - LONDON | 1934 |
| CYCLAID | MOTOR | REINO UNIDO | LARKHALL - SOUTH LANARKSHIRE | 1934 |
| CYCLE COMPONENTS | TRICICLO | REINO UNIDO | BIRMINGHAM - WARWICKSHIRE | 1894 - 1898 |
| CYCLEAUTO | TRICAR | FRANCIA | SURESNES - SEINE | 1919 |
| CYCLEMASTER | MOTOR | REINO UNIDO | LONDON - LONDON COUNTY | 1950 |
| CYCLEMOTOR | MOTOR | USA | ROCHESTER - NEW YORK | 1916 |
| CYCLESTAR | VELOMOTOR | PAISES BAJOS | ROTTERDAM - ZUID-HOLLAND | 1953 |
| CYCLEX | MOTOR AUXILIAR | FRANCIA | - | 1946 |
| CYCLOLUX | MOTOR | FRANCIA | PARIS - SEINE | 1950 |
| CYCLON (Antwerpen) | CICLOMOTOR | BÉLGICA | ANTWERPEN - ANTWERPEN | 1958 |
| CYCLON (Berettyóújfalu) | CICLOMOTOR | HUNGRÍA | BERETTYÓÚJFALU - HAJDÚ-BIHAR | 1966 |
| CYCLONE (Bordeaux) | MOTOR | FRANCIA | BORDEAUX - GIRONDE | 1921 |
| CYCLONE (Launceston) | CICLO-ESCÚTER | AUSTRALIA | LAUNCESTON - TASMANIA | 1915 |
| CYCLONE (St. Paul) | MOTOCICLETA | USA | ST. PAUL - MINNESOTA | 1913 |
| CYCLOP | MOTOCICLETA | ALEMANIA (REP. WEIMAR) | ELSDORF - NORDRHEIN-WESTFALEN | 1922 |
| CYCLORETTE | CICLOMOTOR | FRANCIA | ORLÉANS - LOIRET | 1952 |
| CYCLOTRACTEUR | MOTOR | FRANCIA | LEVALLOIS-PERRET - SEINE | 1913 |