Orkhon Aimag (Mongolian: Орхон аймаг) is one of the 21 Aimags (provinces) of Mongolia, located in the north of the country. Its capital is Erdenet. The province is named after Orkhon River. This Aimag was cut out of Bulgan Aimag in 1994, to form a new entity together with its capital Erdenet, which had previously been administrated as a federal municipality.