Brac is an island in the Adriatic Sea within Croatia, with an area of 396 square kilometres (153 sq mi), making it the largest island in Dalmatia, and the third largest in the Adriatic. It is separated from the mainland by the Brac Channel, which is 5 to 13 km (3 to 8 mi) wide. The island's tallest peak, Vidova gora, or Mount St. Vid, stands at 780 m, making it the highest island point of the Adriatic islands. The island has a population of 13,956, living in numerous settlements, ranging from the main town Supetar, with more than 3,300 inhabitants, to Murvica, where less than two dozen people live. Brac Airport on Brac is the largest airport of all islands surrounding Split.

The economy of Brac is based mostly on tourism, but fishing and agriculture (especially wine and olives) are very important too, as is its precious white stone which was used in building Diocletian's Palace in Split and the Canadian National Vimy Memorial. Very widespread is also the claim that it was used in the White House in Washington, D.C. Historically, Brac was famous for goats; even Pliny comments that from the island of Brattia (the Latin name for the island) comes excellent cheese, wine and olive oil.