B
- B&D Coaches
- Badgerline
- BakerBus
- Barton Transport
- Battersby Silver Grey
- Bebb Travel
- Bellairs and Dootson Coaches
- Birkenhead Buses
- Birmingham & Midland Motor Omnibus Company
- Birmingham City Transport
- Birmingham Motor Traction
- Blackburn Transport
- Blackpool Transport
- Black Prince Buses
- Blazefield Group
- Blue Bus of Bolton
- Blue Bus of North Lanarkshire
- Blue Bus of Penwortham
- Blue Bus of Staffordshire
- Blue Triangle
- Bluebird Bus and Coach
- Bluestar (bus company)
- BoltBus
- Boro'line (London)
- Boro'line Maidstone
- Bournemouth Transport
- Bowers Coaches
- Brighton & Hove (bus company)
- Brijan Tours
- Bristol City Line
- Bristol Omnibus Company
- British Coachways
- Buglers
- Bullocks Coaches
- Burnley & Pendle
- Busways Travel Services
- Bu-Val Buses
- Bygone buses
Read more about this topic: List Of Bus Operators Of The United Kingdom