Bagac, officially the Municipality of Bagac (Tagalog: Bayan ng Bagac), is a municipality in the province of Bataan, Philippines. According to the 2024 census, it has a population of 32,799 people.

According to the Philippine Statistics Authority, the municipality has a land area of 231.20 square kilometres (89.27 sq mi)  constituting 16.84% of the 1,372.98-square-kilometre- (530.11 sq mi) total area of Bataan. Making it the largest municipality in Bataan by land area. It borders provincial capital Balanga to the north, Orion and Limay to the east, Mariveles to the south, and Morong and the South China Sea to the west.

Bagac is situated 25.80 kilometres (16.03 mi) from Balanga, and 151.79 kilometres (94.32 mi) from the country's capital city of Manila.

Bagac is politically subdivided into 14 barangays. Each barangay consists of puroks and some have sitios.

Bagac has a tropical monsoon climate (Am) with little to no rainfall from December to April and heavy to extremely heavy rainfall from May to November.

In the 2024 census, Bagac had a population of 32,799 people. The population density was 140 inhabitants per square kilometre (360/sq mi).

Poverty incidence of Bagac

Source: Philippine Statistics Authority