The Menzelya is a river in Tatarstan, Russian Federation, a former left-bank tributary of the river Ik, which flows into the Nizhnekamsk Reservoir. It is 159 km long, and its drainage basin covers 2120 km2. The river's source is at the village Novy Menzelyabash, Sarmanovsky District, Tatarstan. Major tributaries are the Kholodnaya (Tatarstan), Kamyshly (river), Iganya, Urguda rivers. The maximal mineralization is 400-800 mg/L. The average sediment deposition at the river mouth per year reaches 100 mm. The maximal discharge is 215 m3/s. Drainage is regulated. Since 1978 it is protected as a natural monument of Tatarstan. The town of Menzelinsk is located near the river's mouth. The notable landmark of the river and the town is an abandoned railway bridge, where the railway was never installed.