The Leidse Rijn (Dutch for "Leiden's Rhine") is a canal in the province of Utrecht, Netherlands.

There it connects to the Oude Rijn, which eventually flows into the North Sea at Katwijk aan Zee.

The building of a dam in the Kromme Rijn in 1122 led to a silting up of the old Rhine below Utrecht, especially as it meandered through very flat terrain.

When the part Vleuten-Harmelen ultimately became too narrow and winding as well, in 1381 the Oude Rijn (Old Rhine) canal (Harmelen-Utrecht) was dug.

At the place where the new canal connected to the Oude Rijn the nobleman Everard Meyster built an estate called Oog in Al.