Natonin is a 3rd-class municipality in the Philippines. It is part of Mountain Province in the Cordillera Administrative Region, located in Luzon. It has a population of 10,339 as of the 2020 Census, and a land area of 252 square kilometers. It consists of 11 barangays.

The municipality is very mountainous, with very little level ground lending itself to agriculture. The barangays are geographically isolated by high (700m) mountains covered in jungle.