The Pyakupur () is a river in Yamalo-Nenets Autonomous Okrug, Russia, the left source river of the Pur. The length of the Pyakupur is 542 km. The area of its basin is 31,400 km<sup>2</sup>. There are approximately 32,600 lakes in the river basin. The main tributaries: Vyngypur (right) and Purpe (left). The river's peak month of discharge is June. The average discharge of water 290 m<sup>3</sup>/s.