Mazyr Oil Refinery (; Mozyr Oil Refinery, ) is the oil refinery in Belarus, founded in 1975 in Mazyr district (Gomel region) near the village of Mitski.
It is one of the two Belarusian refineries. The other one Naftan Oil Refinery is situated in the city of Navapolatsk. As of May 2022, Mazyr Oil Refinery processes 13,700 tonnes of oil per day.
In October 2022, Ukraine imposed sanctions on Mozyr Oil Refinery.