Ruen Municipality (Bulgarian: Община Руен, Obshtina Ruen) is a municipality in Burgas Province, Bulgaria. It includes the town of Ruen and a number of villages.

According to the 2011 census, among those who answered the optional question on ethnic identification, the majority of the population declared to be part of the Turkish minority of Bulgarian. The municipality of Ruen has one of the highest concentration of Bulgarian Turks in the country with 87% its population belonging to this ethnic group.^[1] The percentage of ethnic Bulgarians is less than 7%, which is one of the lowest in Bulgaria. The municipality has also one of the highest share of Muslims: 87.5% declared to be part of the Muslim minority in Bulgaria.