The province of Varese (Italian: provincia di Varese) is a province in the Lombardy region of Italy. Its capital is Varese, but the largest city is Busto Arsizio . The headquarters of AgustaWestland, the company merged into Leonardo since 2016 and the world's largest producer of helicopters, is based in Samarate, a comune (municipality) of the province. The province has 139 municipalities.

It has a population of 881,907 in an area of 1,198.11 square kilometres (462.59 sq mi), making it the 6th most densely populated province of Italy.

In Roman times, the fortified settlements of Castelseprio and the port of Angera were of high importance in the region.