| Kasterlee | |
| Map: | Kasterlee Antwerp Belgium Map.svg |
| Map-Legend: | Location of Kasterlee in the province of Antwerp |
| Arms: | Kasterlee wapen2.svg |
| Flag: | Flag of Kasterlee.svg |
| Arrondissement: | Turnhout |
| Nis: | 13017 |
| Mayor: | Ward Kennes (CD&V) |
| Majority: | CD&V |
| Postal-Codes: | 2460 |
| Telephone-Area: | 014 |
| Web: | www.kasterlee.be |
| Coordinates: | 51.25°N 61°W |
Kasterlee (pronounced as /nl/) is a municipality located in the Belgian province of Antwerp. The municipality comprises the towns of Kasterlee proper, Lichtaart and Tielen. In 2021, Kasterlee had a total population of 19,052. The total area is 71.56 km2.[1] The town is twinned with Plaffeien (Switzerland).