The Mountain Province Provincial Board is the Sangguniang Panlalawigan (provincial legislature) of the Philippine province of Mountain Province.
The members are elected via plurality-at-large voting: the province is divided into two districts, each having four seats. A voter votes up to four names, with the top four candidates per district being elected. The vice governor is the ex officio presiding officer, and only votes to break ties. The vice governor is elected via the plurality voting system province-wide.
Aside from the regular members, the board also includes the provincial federation presidents of the Liga ng mga Barangay (ABC, from its old name "Association of Barangay Captains"), the Sangguniang Kabataan (SK, youth councils) and the Philippine Councilors League (PCL). Mountain Province's provincial board also has a reserved seat for its indigenous people (IPMR).
The districts used in appropriation of members is not coextensive with the legislative district of Mountain Province; unlike congressional representation which is at-large, Mountain Province is divided into two districts for representation in the Sangguniang Panlalawigan.
The first district includes the eastern side of the province, encompassing the capital, Bontoc, as well as the municipalities of Barlig, Natonin, Paracelis, and Sadanga. The second district comprises the western municipalities of Bauko, Besao, Sabangan, Sagada, and Tadian.
In 2025, the first and second districts gained one additional seat each after the Department of Finance upgraded the province's income classification to 2nd class, from 4th class.
These are the members after the 2025 local elections and 2023 barangay and SK elections: