List of bus routes in London

This is a list of Transport for London (TfL) contracted bus routes in London, England, as well as commercial services that enter the Greater London area (except coaches).

Bus services in London are operated by Arriva London, Go-Ahead London (London Central, London General, Docklands Buses and Blue Triangle), Metroline, First Bus London (London Sovereign, London United and London Transit), Stagecoach London (East London, Selkent, Thameside and Lea Interchange Bus Company), Transport UK London Bus and Uno. TfL-sponsored operators run more than 500 services.

Examples of non TfL-sponsored operators include, but are not limited to: Arriva Herts & Essex, Carousel Buses, Diamond South East, Go-Coach, First Beeline, Metrobus, Thames Valley Buses and Reading Buses.

In Victorian times, people who took the bus would recognise the owner and the route of an omnibus (Latin for 'for all') only by its livery and its line name, with painted signs on the sides showing the two termini to indicate the route. Then, in 1906, George Samuel Dicks of the London Motor Omnibus Company decided that, as the line name 'Vanguard' had proved to be very popular, he would name all lines 'Vanguard' and number the company's five routes 1 to 5. Other operators soon saw the advantage, in that a unique route number was easier for the travelling public to remember, and so the practice of using route numbers soon spread.

Bus routes run by London Transport were grouped as follows.

The London Traffic Act 1924 imposed numbering known as the Bassom Scheme, named after Superintendent (later Chief Constable) Arthur Ernest Bassom of the Metropolitan Police who devised it. For many decades, variant and short workings used letter suffixes (e.g. "77B"). The numbers reflected the company that operated the route.

The numbering was revised in 1934 after London Transport was formed:

All routes operate in both directions unless detailed.