C
- Cango
- Capital Citybus
- Capital Logistics
- Cardiff Bus
- Carousel Buses
- Carters Coach Services
- Cavendish Motor Services
- Centra (bus company)
- Central Scottish
- Centrebus
- Centrebus Holdings
- H.C. Chambers & Son
- Chase Coaches
- Checkmate Transport
- Cheltenham and Gloucester Omnibus Company
- Choice Travel
- Citibus Tours
- City Clipper
- CityFox Bristol
- Clyde Fastlink
- Clydeside Scottish
- Courtney Coaches
- ComfortDelGro
- Comfy Coaches
- Compass Bus
- Connect Buses
- Connect2Wiltshire
- Connex bus
- Cotswold Green
- Countryliner Coaches
- County Bus & Coach
- Countywide Travel
- Crawley Fastway
- Crosville Motor Services
- Crossgates Coaches (formerly Veolia Transport Cymru)
- CT Plus
- Cuckmere Community Bus
- Cumfybus
Read more about this topic: List Of Bus Operators Of The United Kingdom