The Ilme is a left-bank, western tributary of the River Leine in Lower Saxony, Germany. It is 33.0 km (20.5 mi) long.

The river begins at the pond Neuer Teich [de] in the centre of the Solling hills at an elevation of 340 m above sea level (NN) and flows initially northwards to Dassel, then in an easterly direction through Markoldendorf [de] (a district of Dassel) to Einbeck, after which it discharges into the Leine near Volksen at an elevation of 105 m (344 ft).

• List of rivers of Lower Saxony