The Province of Monza and Brianza, (Italian: Provincia di Monza e della Brianza), is an administrative province of Lombardy region, Italy. It was officially created splitting the eastern part from the province of Milan on May 12, 2004, and became executive after the provincial elections of 6 and 7 June 2009.

It has an area of 405.49 km², that is one of the smallest provincial territories of Italy, and a population of almost 850,000 at the end of 2010, with a population density of more than 2,000 inhab./km2, given by its highly urbanized territory.

The capital and most important commune is Monza (pop. 121,441 as of 30/11/09), only 15 km far away from Milano. Other important centres are (referred to 2001 population): Seregno (39,206), Desio (35,069), Limbiate (31,551), Lissone (34,450), Vimercate (25,536), Cesano Maderno (33,094) and Brugherio (31,470).

It borders the provinces of Lecco and Como to the north, the province of Varese to the west, the province of Bergamo to the east and the province of Milan to the south and also to the east.