The Dyle (French: Dyle, Walloon: Tîle) is a Brabant river that flows through the Belgian provinces of Walloon Brabant, Flemish Brabant and Antwerp. It is part of the Scheldt basin. The area east of Brussels, through which the Dyle flows, is called the Dijleland.
The most important places on the Dyle are, downstream, Ottignies-Louvain-la-Neuve, Waver, Leuven, Werchter and Mechelen. The river is 86 kilometres long.
This river rises in Houtain-le-Val, a sub-municipality of Genappe in Walloon Brabant. Initially, the Dyle flows fairly freely in a northeasterly direction. South of Leuven, the Thyle, the Train, the Nethen, the Laan and the IJse flow into the Dyle; in Leuven itself, the Voer as well. In Werchter the Demer flows into the Dijle, which then makes a bend to the west. In Mechelen the Dijle is split into an Inner Dijle and an Afleidingsdijle. Finally, just after the Zenne flows into its course, the Dijle merges with the Nete into the Rupel in Rumst.