The Masaryk circuit or Masarykring, also referred to as the Brno Circuit, refers to two motorsport race tracks located in Brno, Czech Republic. The original street circuit was made up of public roads, and at its longest measured 29.194 km (18.140 mi). In 1949, events such as the Czechoslovakian Grand Prix attracted top teams and drivers. The track is named after the first president of Czechoslovakia, Tomáš Garrigue Masaryk. Racing on the old roads ended after 1986, when the new (current) circuit was opened. Since August 2023, the circuit is owned by Shakai.

Brno is a city in the South Moravian Region of the Czech Republic. Located at the confluence of the Svitava and Svratka rivers, Brno has about 400,000 inhabitants, making it the second-largest city in the Czech Republic after the capital, Prague, and one of the 100 largest cities of the European Union. The Brno metropolitan area has approximately 720,000 inhabitants.