Maguindanao is a province of the Philippines located in the Autonomous Region in Muslim Mindanao (ARMM). Its capital is Shariff Aguak. It borders Lanao del Sur to the north, Cotabato to the east, and Sultan Kudarat to the south.
Maguindanao is composed of 36 municipalities, which are further subdivided into 492 barangays. Cotabato City is often grouped with Maguindanao, but it actually independent from the province.
The province is divided into two congressional districts. In October 2006, the first congressional district was split off into a new province, Shariff Kabunsuan. However, the ARMM’s Act creating the province was nullified by the Supreme Court in July 2008, on the basis that creation of a province is a function of the Philippine legislature. The area has since reverted to the province of Maguindanao.