|Location||Brno, Czech Republic|
|Permanent Circuit (1987-present)|
|Length||5.403 km (3.357 mi)|
|Turns||14 (8 right, 6 left)|
|Race lap record||1:36.065 (ITom Beckhauserl, TopSpeed, Toro Rosso STR1, BOSS GP, 2017)|
|4th Road Circuit (1975-1986)|
|Length||10.925 km (6.789 mi)|
|Race lap record||3:29.91 (Johnny Cecotto, Yamaha, 1977, 500cc/MotoGP)|
|3rd Road Circuit (1964-1974)|
|Length||13.941 km (8.663 mi)|
|Race lap record||4:59.1 (Jochen Mass, Ford Capri RS 2600, 1972, Touring cars)|
|2nd Road Circuit (1949-1963)|
|Length||17.800 km (11.061 mi)|
|Race lap record||8:03.0 (B.Bira/Toulo de Graffenried, Both Maserati, 1949, Grand Prix)|
|Original Road Circuit (1930-1948)|
|Length||29.194  km (18.109 mi)|
|Race lap record||11:59.3 (Rudolf Caracciola, Mercedes, 1937, Grand Prix)|
The Masaryk circuit (Czech: Masaryk?v okruh) 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 (29 km). 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, Tomá? Masaryk. Racing on the old roads ended after 1986, when the new (current) 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.
The Czech Republic Motorcycle Grand Prix has always been more of a promoter event than a profit-raiser in itself; tobacco advertising has been banned since 2007.
The original layout ran anti-clockwise on approximately 29 km (18 mi) of public roads west of Brno, including the villages of Bosonohy and ?eb?tín. From 1930 to 1937, the Masaryk Grand Prix attracted some of the top drivers and teams.
The renamed Czechoslovakian Grand Prix in 1949 was run clockwise on a shorter 17.8 km (11.1 mi) layout around Kohoutovice. In spite of a crowd in excess of 400,000 people, this would be the last Grand Prix for cars on the old circuit.
Beginning in 1950, the circuit played host to the Czechoslovakian motorcycle Grand Prix, which became a world championship event from 1965 to 1982. The circuit had been again reduced in length to 13.94 km (8.66 mi) in 1964. The European Touring Car series visited in the 1980s, by which time the circuit had been finally reduced to 10.92 km (6.79 mi) in 1975.
The current permanent road racing circuit was opened in 1987. It lies north of Kyvalka, within the bounds of the circuit used in the 1930s, but not incorporating any of the public roads. The motorcycle race moved to the new circuit and regained its status as a round of the world championship. A World Sports Car Championship race was held in 1988, and a round of the A1 Grand Prix series in 2006. It is also the location of the 24H Epilog of Brno (previously 6 Hours of Brno).