Thailand Circuit Nakhonchaisri, often referred to simply as Thailand Circuit, is a motorsport facility located in Nakhonchaisri, Nakhon Pathom Province, Thailand. Opened in 1992, it has played a significant role in the development of Thai motorsports, hosting a variety of national and international racing events.

The circuit features a 2.540 km (1.578 mi) layout designed with a mix of high-speed straights and challenging corners. The track's configuration encourages overtaking opportunities, providing exciting racing for both drivers and spectators. The layout consists of ten turns, including several hairpin corners and flowing sections that demand precision and control. The main straight is long enough to allow for significant speed build-up before entering the first corner.

Technically, Thailand Circuit is relatively flat, lacking significant elevation changes. However, the tight and technical nature of the corners still provides a considerable challenge for drivers. The track surface is known to be quite abrasive, which can lead to higher tire wear. Although not a Formula 1 standard circuit, it meets FIA Grade 4 homologation, allowing it to host a range of international racing categories below Formula 1. Pit facilities are adequate, with garages and paddock space to accommodate teams and support personnel.

Thailand Circuit primarily hosts local racing events, including touring car championships, motorcycle racing, and various club-level competitions. It has also been a venue for international events such as the Asian Formula Renault Series and other regional racing series. The circuit's accessible location near Bangkok makes it a popular choice for both racers and fans.

What makes Thailand Circuit unique is its historical significance as one of Thailand's first permanent racing circuits. It has fostered the growth of motorsports in the country, providing a platform for local talent to develop and compete. While not as glamorous as some of the newer circuits in Asia, Thailand Circuit holds a special place in the hearts of Thai racing enthusiasts due to its history and contribution to the sport.