The Ihme (Wennigser Mühlbach in its upper course) is a river of Lower Saxony, Germany. It is a left tributary of the Leine. The Ihme is 26 km long. Its source is in the village Evestorf a district of Wennigsen. After about 6 km, the Ihme reaches the city of Hanover, where it flows into the Leine. In order to protect the city centre of Hanover from flooding, much of the water of the Leine is rerouted by a ditch into the Ihme. A bridge over the Ihme is named in memory of Benno Ohnesorg. The Ihme gives its name to the village Ihme that, together with the village Roloven, forms the Ronnenberg district of Ihme-Roloven