Map - City of Brussels (Brussels)

The City of Brussels (Ville de Bruxelles or alternatively Bruxelles-Ville ; Stad Brussel or Brussel-Stad) is the largest municipality and historical centre of the Brussels-Capital Region, as well as the capital of the Flemish Region (from which it is separate) and Belgium. The City of Brussels is also the administrative centre of the European Union, as it hosts a number of principal EU institutions in its European Quarter.

Besides the central historic town located within the Pentagon, the City of Brussels covers some of the city's immediate outskirts within the greater Brussels-Capital Region, namely the former municipalities of Haren, Laeken, and Neder-Over-Heembeek to the north, as well as the Avenue Louise/Louizalaan and the Bois de la Cambre/Ter Kamerenbos park to the south-east, where it borders municipalities in Flanders.

, the City of Brussels had a total population of 176,545. The total area is 32.61 km2 which gives a population density of 5475 PD/km2. As of 2007, there were approximately 50,000 registered non-Belgians in the City of Brussels. In common with all of Brussels' municipalities, it is legally bilingual (French–Dutch).

Historically, the City of Brussels was simply defined, being the area within the second walls of Brussels, the modern-day Small Ring (Brussels' inner ring road). As the city grew, the surrounding villages grew as well, eventually growing into a contiguous city, though the local governments retained control of their respective areas.

The construction of the Avenue Louise/Louizalaan was commissioned in 1847 as a monumental avenue bordered by chestnut trees that would allow easy access to the popular recreational area of the Bois de la Cambre/Ter Kamerenbos. However, fierce resistance to the project was put up by the town of Ixelles (which was then still separate from Brussels) through whose land the avenue was supposed to run. After years of fruitless negotiations, Brussels finally annexed the narrow band of land needed for the avenue plus the Bois de la Cambre itself in 1864. That decision accounts for the unusual southeastern protrusion of the City of Brussels and for Ixelles being split in two separate parts. Part of the Université libre de Bruxelles (ULB)'s Solbosch campus is also part of the City of Brussels, partially accounting for the bulge in the southeast end.

Unlike most of the municipalities in Belgium, the ones located in the Brussels-Capital Region were not merged with others during mergers occurring in 1964, 1970, and 1975. However, a few neighbouring municipalities have been merged into the City of Brussels, including Haren, Laeken and Neder-Over-Heembeek in 1921. These comprise the northern bulge in the municipality. To the south-east is also a strip of land along the Avenue Louise that was annexed from Ixelles.