The Popigay River (Russian: река Попигай) is a river in Krasnoyarsk Krai, Russia. The length of the river is 532 kilometers (331 mi). The area of its drainage basin is 50,300 square kilometers (19,400 sq mi). The river freezes up in October and breaks up in June. Its main tributaries are the Rassokha and Fomich Rivers.