The Caterham 21 is a two-seat roadster designed and hand built by Caterham Cars in the 1990s. It was based on the mechanicals of the Caterham 7 and was intended to be a more practical version of that car with more conventional sports car styling.
The original car was produced for the 1994 British Motor Show to celebrate 21 years of Caterham Cars manufacture of the Lotus Seven. Styled by Iain Robertson and developed by a team under Jez Coates, the aim was to have a car that offered "the chance to experience Caterham motoring in a more practical format". The 21 was offered with a range of four-cylinder engines from 1.6 to 2.0L, with 115 to 230hp. Caterham originally intended to produce 200 cars per year, but fewer than 50 were actually made before production ceased. Several variations were created to participate in racing events.
The current owners run a regular gathering at a sprint track in the UK, with over 16 cars attending each year out of 48 produced.