Frederiksberg Kommune is a municipality (Danish, kommune) on the island of Zealand (Sjælland) in Denmark. It is surrounded by the city of Copenhagen. The municipality, co-extensive with its seat, covers an area of 8.7 km2 (3.4 square miles; 870 hectares) and has a population of 102,682 (1 April 2014) making it the smallest municipality in Denmark area-wise, the fifth most populous one, and the most densely populated one. Its mayor is Jørgen Glenthøj, a member of the Conservative People's Party (Det Konservative Folkeparti).
The city of Frederiksberg is the only town in the municipality, and is therefore the site of its municipal council.
Frederiksberg is located as an enclave within the municipality of Copenhagen, the national capital. The municipality was originally situated west of Copenhagen, but after a number of smaller municipalities were merged with Copenhagen in 1901, it became completely surrounded by Copenhagen.
Frederiksberg was one of the three last Danish municipalities not belonging to a County—the others being Copenhagen and Bornholm. On 1 January 2007, the municipality lost its county privileges and became part of Region Hovedstaden (i.e. the Copenhagen Capital Region).