The Odelouca River is a river in the Portuguese region of the Algarve. The river is a tributary of the Arade River.
The Odelouca headwater sources are a number of small streams and brooks rising from springs between the Serra de Monchique and the Serra do Caldeirão. The river riparian margins are dense and, at times, lush with vegetation. These woody flanks are populated by Narrow leaf Ash, Willows, Poplar and Alder trees. In the lower reaches of the river can be found Tamarix and Oleander. Many of these riparian zones were lost following the construction of the Odelouca Dam (Barragem de Odelouca). From it headwater sources the river, which flows through the village of São Marcos da Serra, runs for approximately 83.7 kilometres until its confluence with the Arade River west of the town of Silves.
