The Duomo of Monza, often known in English as Monza Cathedral, is the main religious building of Monza, Italy. Unlike most duomi, it is not in fact a cathedral, as Monza has always been part of the Diocese of Milan, but is in the charge of an archpriest who has the right to certain episcopal vestments including the mitre and the ring. The church is also known as the Basilica of San Giovanni Battista from its dedication to John the Baptist.

Monza is a city and comune (municipality) on the River Lambro, a tributary of the River Po, in the Lombardy region of Italy, about 15 kilometres north-northeast of Milan. It is the capital of the province of Monza and Brianza. Monza is best known for its Grand Prix motor racing circuit, the Autodromo Nazionale di Monza, which hosts the Formula One Italian Grand Prix.