The Alcoa () is a river of Portugal, flowing into the Atlantic Ocean.José Pedro Duarte Tavares: Hydraulics, Lines of Cistercian Hydraulic System in Alcobaça , in: Cultural Route of the Region of Alcobaça. S. 39-109, Alcobaça 2001, It rises in the municipality of Alcobaça and flows into the ocean near Nazaré. The river section below the confluence with its tributary Baça is also referred to as ''Alcobaça''.

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Rivers of Portugal Drainage basins of the Atlantic coast of Iberia {{portugal-river-stub