Monbetsu is a district located in Okhotsk Subprefecture, Hokkaido, Japan. In 1869, Hokkaido was divided into 11 provinces and 86 districts. Monbetsu was originally placed in Kitami Province. As of 2004, the district has an estimated population of 49,851 and a population density of 12.74 persons per km2. The total area is 3,912.51 km2.