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| Parent | FirstGroup |
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| Founded | February 28, 2025 |
| Headquarters | London |
| Service area | Greater London |
| Service type | Bus operator |
| Depots | 10 |
| Fleet | 982 (February 2025) |
| Fuel type | Diesel and electric |
| Managing directors | Colin Brown Bill Cahill |
| Website | www.firstbus.co.uk |
First Bus London is a bus operator running services across Greater London, England. It is a subsidiary of FirstGroup, operating buses under contract to Transport for London, and was formed with the purchase of RATP Dev Transit London from RATP Group in 2025.