Beersel (Dutch: [ˈbeːrsəl] ) is a municipality in the province of Flemish Brabant, in the Flemish region of Belgium, 12 kilometres (7.5 mi) south-west of the centre of Brussels. The municipality comprises the towns of Alsemberg, Beersel proper, Dworp, Huizingen and Lot. On 1 January 2023, Beersel had a total population of 26.473. The total area is 30.01 km (11.59 sq mi), which gives a population density of 856/km (2,220/sq mi).

Beersel is perhaps best known for Beersel Castle, built between 1300 and 1310 by Jean II, Duke of Brabant, as a defense for Brussels. Guillaume Dufay, a notable 15th-century Franco-Flemish composer, was likely born in Beersel. In terms of gastronomy, Beersel is known for its boterham met plattekaas en radijzen (sandwich with white cheese and radishes), usually served with a geuze beer, and for its mandjeskaas (literally 'basket cheese'), which is a white cheese stored in little baskets. Beersel also has two traditional, authentic geuze breweries, Oud Beersel and 3 Fonteinen.

• Eugène Prévinaire (1805–1877, Huizingen), second governor of the National Bank of Belgium (NBB) from 1870 until 1877
• Herman Teirlinck (1879–1967), writer
• Stéphane Demol (1966–2023), assistant manager of the Belgium national football team
• Morten Olsen (born 1949), former football player and manager of the Denmark national football team
• Karel Van Miert (1942–2009), former European Commissioner
• Guillaume Dufay (1397?–1474), Burgundian composer

• Pryer, Anthony; Fallows, David (2011). "Dufay, Guillaume". In Latham, Alison (ed.). The Oxford Companion to Music. Oxford: Oxford University Press. ISBN 978-0-19-957903-7.

• Media related to Beersel at Wikimedia Commons
• Official website - Only available in Dutch
• Gazetteer Entry