British F3 International Series
| Category | Single seaters |
|---|---|
| Country |
 United Kingdom
|
| Inaugural season | 1951 |
| Folded | 2014 |
| Drivers | 20 |
| Teams | 6 |
| Constructors | Dallara |
| Engine suppliers |
Mercedes HWA Volkswagen |
| Tyre suppliers | Cooper Tires |
| Last Drivers' champion |
 Martin Cao
|
| Official website | www |
The British Formula Three Championship was an international motor racing series that took place primarily in the United Kingdom with a small number of events in mainland Europe. It was a junior-level feeder formula that used small single seater Formula Three chassis. Its final official title was the Cooper Tires British Formula 3 International Series. Notable former champions included Jim Clark, Jackie Stewart, Emerson Fittipaldi, Nelson Piquet, Ayrton Senna, Mika Häkkinen, Rubens Barrichello and Daniel Ricciardo.
The first Formula Three championship to take place in the UK was the Autosport F3 championship held in 1951, which was won by Eric Brandon. By 1954, it had evolved into a national-level series and was organised by the British Racing and Sports Car Club (BRSCC). This was the 500cc period of Formula Three, which was active in the UK and other countries until 1959, at which point Formula Three was adapted into Formula Junior. In this period, there were often two or three series running concurrently and a single national series had yet to be firmly established.
The FIA reintroduced Formula Three in 1964 using a one-litre engine formula, and there were two F3 championships held in the UK that year. This was not the last occasion of two or more F3 championships running concurrently in the post-1964 era: from 1970 to 1973, there were three regional series (the Lombard North, John Player, and Forward Trust championships) and there were normally two series between then and 1978, with many drivers running in both. From 1979 onwards, there would be a single championship as the BARC and BRDC combined their series into the Vandervell British F3 Championship, which was later renamed for sponsorship reasons to the Marlboro British F3 Championship and then the Lucas British F3 Championship.
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