This is a list of most populous municipalities in Belgium. Out of the 565 Belgian municipalities (as of 1 January 2025) the list contains all those with a population over 30,000.
Belgium is divided into municipalities, however a municipality may or may not have an additional royally-decreed city status. For example, Brussels is a federal region of 19 municipalities, the City of Brussels being only one of them.
Municipalities marked with * or ** have recently (* in 2019 and ** in 2025) been the subject of a merger of two or three former municipalities, population figures for years prior to these mergers take into account the population of all the municipalities involved.