The Rivière de l'Est is a river on the Indian Ocean island of Réunion. It flows northeast from the southeast of the island, reaching the sea between the towns of Sainte-Anne and Sainte-Rose. It is 21.2 km (13.2 mi) long.

The Rivière de l'Est flows down the slopes of the shield volcano Piton de la Fournaise from an elevation of 720 metres (2,350 ft) above sea level.