Nikšić Municipality is one of the municipalities of Montenegro. The municipality is located in the central and northwestern region of Montenegro. The administrative centre of the municipality is the town of Nikšić.

Nikšić, is the second largest city in Montenegro, with a total population of 56,970 located in the west of the country, in the centre of the spacious Nikšić field at the foot of Trebjesa Hill. It is the center of Nikšić Municipality with population of 66,725 according to 2023 census, which is the largest municipality by area and second most inhabited after Podgorica. It was also the largest municipality by area in the former Yugoslavia. It is an important industrial, cultural, and educational center.