Monbetsu is a city located in Okhotsk Subprefecture, Hokkaido, Japan; on the Sea of Okhotsk. The name comes from Ainu Mopet, Ainu "-pet" would be interpreted "-betsu" in Japanese as well of other city names in Hokkaido. It is often called Okhotsk-Monbetsu to distinguish it from the town of Monbetsu in Hidaka Subprefecture.