The 137,000 capacity Autodromo Nazionale Monza is a race track located near the city of Monza, north of Milan, in Italy.  The circuit's biggest event is the Formula One Italian Grand Prix.  With the exception of 1980, the race has been hosted there since the series's inception.

Built in the Royal Villa of Monza park in a woodland setting, the site has three tracks – the 5.793-kilometre (3.600 mi) Grand Prix track, the 2.405-kilometre (1.494 mi) Junior track, and a 4.250-kilometre (2.641 mi) high speed oval track with steep bankings which has been unused for many decades and is now decaying.  The major features of the main Grand Prix track include the Curva Grande, the Curva di Lesmo, the Variante Ascari, and the Curva Parabolica.  The high speed curve, Curva Grande, is located after the Variante del Rettifilo which is located at the end of the front straight or Rettifilo Tribune, and is usually taken flat out by Formula One cars.

Drivers are on full throttle for most of the lap due to its long straights and fast corners, and is usually the scenario in which the open-wheeled Formula One cars show the raw speed they are capable of:  372 kilometres per hour (231 mph) during the mid-2000s V10 engine formula, although in 2012 with the 2.4L V8 engines, top speeds in Formula One rarely reached over 340 kilometres per hour (211 mph).  The 1.6L turbocharged hybrid V6 engine, 8-speed gearbox formula of 2014 displayed top speeds of up to 362 kilometres per hour (225 mph).

The circuit is generally flat, but has a gradual gradient from the second Lesmos to the Variante Ascari.  Due to the low aerodynamic profile needed, with its resulting low downforce, the grip is very low; understeer is a more serious issue than at other circuits.  However, the opposite effect, oversteer, is also present in the second sector, requiring the use of a very distinctive opposite lock technique.  Since both maximum power and minimal drag are keys for speed on the straights, only competitors with enough power or aerodynamic efficiency at their disposal are able to challenge for the top places.

In addition to Formula One, the circuit hosts an endurance event, the 1000 km Monza, which has been run as part of the World Sportscar Championship and the Le Mans Series.  Monza also featured the unique Race of Two Worlds events, which attempted to run Formula One and United States Auto Club National Championship cars against each other, and previously hosted rounds of Grand Prix motorcycle racing, in the Italian motorcycle Grand Prix.  Current major events are races of the World Touring Car Championship and the Superbike World Championship, as well as various local championship races.

The Monza circuit has been the arena of many fatal accidents, especially in the early years of the Formula One world championship, and has claimed the lives of 52 drivers and 35 spectators.  Track modifications have continuously occurred, to improve spectators safety and reduce curve speeds, but it is still criticised by the current drivers for its lack of run-off areas, most notoriously at the chicane that cuts the Variante della Roggia.