The Mount Inayawan Range Natural Park is a protected area of forested mountains in the Northern Mindanao region of the Philippines. The park encompasses the mountain range also known as Mount Iniaoan located in the landlocked municipality of Nunungan in Lanao del Norte and covers a total area of 3,632.74 hectares with a buffer zone of 889.04 hectares. The area was officially designated as a natural park on 30 July 2007 through Proclamation No. 1344 signed by President Gloria Arroyo. It is a critical watershed area and the largest remaining rainforest in Lanao del Norte.