The province of Campobasso (Italian: provincia di Campobasso; Molisan dialect: pruìnge de Cambuàsce) is a province in the Molise region of Italy. Its capital is the city of Campobasso. It covers an area of c. 2,941 square kilometres (1,136 sq mi) and has a total population of 223,871 (2017). There are 84 comuni (sg.: comune) in the province.
The eastern part of the province is home to a small Croatian minority who speak an archaic dialect of Croatian. The Croatians reside primarily in Acquaviva Collecroce, San Felice and Montemitro.