Noboribetsu (登別市, Noboribetsu-shi?, Ainu: nupur-pet) 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. The name, Noboribetsu, derives from an Ainu word, nupur-pet, which means dark-coloured river (the kanji 登別 are used for their phonetic value only, and have no relation to the original meaning).