Noboribetsu is a city in Iburi Subprefecture, Hokkaido, Japan. 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.