The Masaryk circuit (Czech: Masarykův okruh) or Masarykring, now referred to as the Brno Circuit, is a Czech racing circuit located close to the city of Brno at Kohoutovice. It was used before and after WWII for events such as Grand Prix Masaryk measuring up to 19 miles (31 km) in length before the existence of Formula One. It was formerly the site of the pre-war Czechoslovakian Grand Prix and is now used primarily for motorcycle races. in 1962, the track was shortened again to 8.66 miles (13.94 km).

The modern track circuit also held the second round of the second season of the A1 GP series. Still, the annual Grand Prix of the Czech Republic is the most important event held there.

The current track was built in the second half of 1980s. The historical track led through the streets of western part of Brno and neighboring villages, such as Bosonohy and Žebětín. The first Grand Prix race, the Czechoslovakian Grand Prix, was held in 1930.