GB3 Championship
| Category | Single seaters |
|---|---|
| Country | United Kingdom |
| Inaugural season | 2013 |
| Constructors | Tatuus |
| Engine suppliers | Ford Duratec |
| Tyre suppliers | Pirelli |
| Drivers' champion | Louis Sharp |
| Official website | www |
| Current season | |
The GB3 Championship is a single seater motorsport series based in the United Kingdom. The championship is the UK's premier single-seater category, and is aimed at young racing drivers moving up from FIA Formula 4 championships, the GB4 Championship or Karting. Having previously been known since 2013 as the BRDC Formula 4 Championship, the championship was renamed the BRDC British Formula 3 Championship with the backing of the FIA in March 2016. The championship was rebranded to GB3 Championship in August 2021.
Like most junior formula series, it is a spec series, meaning all competitors use identical cars, engines, and tyres. While not officially branded as a Formula Regional series, the car specification for the 2025 season conforms to that of Formula Regional. Previous cars have been similar in performance to FR.