Opaka Municipality (Bulgarian: Община Котел) is a municipality in the Targovishte Province of Bulgaria.

Ethnic composition of Opaka Municipality At the 2011 census, the population of Opaka was 6,664.

Most of the inhabitants were Turks (57.89%), with a minority of Bulgarians (21.5%).

[1][2] 20.46% of the population's ethnicity was unknown.

In addition to the capital town of Opaka, there are 5 villages in the municipality: