| Londerzeel | |
| Picture-Legend: | Steenhuffel church |
| Map: | Londerzeel Flemish-Brabant Belgium Map.svg |
| Map-Legend: | Location of Londerzeel in Flemish Brabant |
| Arms: | Blason Londerzeel.svg |
| Flag: | Londerzeel vlag.svg |
| Arrondissement: | Halle-Vilvoorde |
| Nis: | 23045 |
| Mayor: | Conny Moons (LWD) |
| Majority: | CD&V, LWD, Groen) |
| Postal-Codes: | 1840 |
| Telephone-Area: | 052, 015 |
| Web: | www.londerzeel.be |
| Coordinates: | 51°N 22°W |
Londerzeel (in Dutch; Flemish pronounced as /ˈlɔndərzeːl/) is a municipality located in the Belgian province of Flemish Brabant. The municipality comprises the towns of Londerzeel proper, Malderen, Steenhuffel (home of Palm Breweries) and Sint-Jozef. On 1 January 2018, Londerzeel had a total population of 18,620. The total area is 36.53 km2 which gives a population density of 510 inhabitants per km2.
Their football team is K. Londerzeel S.K.
Londerzeel has been twinned with Gladenbach (Germany) since 2010.