Mountain Province (Filipino:Lalawigang Bulubundukin) is a landlocked province of the Philippines in the Cordillera Administrative Region in Luzon. Its capital is Bontoc.

Mountain Province is bounded in the east by Isabela, in the north by the provinces of Kalinga, Apayao, and Abra, in the south of Benguet and Ifugao, and in the west by the province of Ilocos Sur. It has an area of 229,231 hectares with 83% mountainous while 17% make up hills and levels. The province has plenty of rivers, waterfalls, mountains, and caves.

Mountain Province is sometimes incorrectly named Mountain in some foreign references. The name is also incorrectly shortened by locals to Mt. Province, which in turn is read by native Anglophones as "Mount Province". The province was named so for being in the Cordillera Central mountain range found in the upper realms of Luzon island.

Mountain Province was also the name of the historical province that included most of the current Cordillera provinces. This old province was established by the Americans in 1908 and was later split in 1966 into Mountain Province, Benguet, Kalinga, Apayao and Ifugao.