The Arrondissement of Mechelen (Dutch: Arrondissement Mechelen; French: Arrondissement de Malines) is one of the three administrative arrondissements in the Province of Antwerp, Belgium. It is both an administrative and a judicial arrondissement, as the territory for both coincides.
The Arrondissement of Mechelen was created in 1800 as the third arrondissement in the Department of Deux-Nèthes (Dutch: Departement Twee Nethen). It originally comprised the cantons of Duffel, Heist-op-den-Berg, Lier, Mechelen and Puurs. In 1977, the then municipality of Muizen was added to the arrondissement from the Arrondissement of Leuven, and was merged into the City of Mechelen.
The Administrative Arrondissement of Mechelen consists of the following municipalities: