Noboribetsu (登別市, Noboribetsu-shi, Ainu: nupur-pet) is a city in Iburi Subprefecture, Hokkaido. Part of Shikotsu-Toya National Park, it is southwest of Sapporo, west of Tomakomai and northeast of Hakodate. As of September 2016, the city has an estimated population of 49,523, and a population density of 230 persons per km². The total area is 212.11 km². The city office is in Horobetsu. The town of Noboribetsu is at the mouth of the Noboribetsu river and is, therefore, a much narrower area.