Touring car racing is a form of motorsport racing featuring production-based cars that are modified for competition. The discipline emphasizes close racing, balanced performance, and manufacturer diversity, with cars that still resemble their road-going counterparts. Originating in Europe in the mid-20th century, touring car racing has since expanded globally through rule sets such as Group A, Super Touring, and the FIA TCR formula. Major championships include the British Touring Car Championship (BTCC), German Touring Car Masters (DTM), and Supercars Championship. It has both similarities to and significant differences from stock car racing, which is popular in the United States.
Modern touring car championships increasingly rely on Balance of Performance (BoP) and cost-control regulations to ensure close competition among manufacturers and private teams. The adoption of hybrid technology and the introduction of electric touring car series, such as the ETCR (now FIA E-Touring Car World Cup), mark the category’s adaptation to sustainability trends in motorsport. While the cars do not move as fast as those in formula or sports car races, their similarity both to one another and to fans' own vehicles makes for well-supported racing. The lesser use of aerodynamics means following cars have a much easier time passing than in open-wheel racing, and the more substantial bodies of the cars makes the subtle bumping and nudging for overtaking much more acceptable as part of racing.