Sports 2000 is a restricted-rules class of two-seat, rear-engined, open-cockpit, full-bodied sports-prototype racecar used largely in amateur road racing. Sometimes known as S2000 or S2, the class was developed by John Webb, then of the Brands Hatch racing circuit in England, as an affordable form of sports car racing, essentially a sports car version of Formula Ford 2000. The key attributes of the class were a body design reminiscent of two-liter Group 6 sports racing cars like the Chevron B21 and Lola T-212 but with an ultra-reliable and inexpensive drivetrain comprising a two-liter "Pinto" overhead camshaft engine with very limited allowed modifications and the well-proven, VW-based Hewland Mk 9 transaxle. S2000 aerodynamics continued to evolve beyond their 1970s Group 6 roots, with very 'slippery' cars featuring spats over the wheels becoming the norm.

In the UK S2000 was largely seen as an alternative to front-engined Clubmans racing, a class for amateurs who were often deeply involved in developing their own cars over periods of years. The category suffered due to the demise of FF2000 in the late 80s, and further when Clubmans transformed into the rear-engined National Supersports category, but it has recently undergone something of a revival in both historic and contemporary forms as a (relatively) low-cost form of sports car racing.