Dijle (Dutch, in French: Dyle) is a river in central Belgium. It is about 100 km (62 miles) long. It flows through the Belgian provinces Walloon Brabant, Flemish Brabant and Antwerp. Its source is in Houtain-le-Val, near Nivelles.
The most important towns along the Dijle are (starting from the source) Ottignies, Wavre, Leuven and Mechelen. Tributaries of the Dijle are the rivers Demer (in Werchter, Rotselaar municipality) and the Zenne (near Rumst). Just after the confluence with the Senne, the Dijle forms the river Rupel together with the river Nete. The Dijle is navigable for small ships from Werchter on.
From 1795 until 1815, when Belgium, the Netherlands and parts of Germany were incorporated into France, there was a département named after the river Dijle, see Dyle (département).