The Masaryk circuit or Masarykring, now referred to as the Brno Circuit, refers to two motorsport race tracks located close to the city of Brno, Czech Republic.
The original street circuit was made up of public roads, and at its longest measured 18 miles. In the 1930s, events such as the Masaryk Grand Prix attracted top teams and drivers. The track is named after the first president of Czechoslovakia, Tomáš Masaryk. Racing on the old roads ended after 1986, when the new circuit was opened.
The annual Motorcycle Grand Prix of the Czech Republic is the circuit's most important event. It is held here since 1950 and is the most famous motor race in the Czech Republic. Championship is part of the World Grand Prix since 1965.