The Itaúnas River () is a river of Espírito Santo state in eastern Brazil.
The Itaúnas State Park, created in 1991, is named after the Itaúnas River, which runs through the park for . The river approaches the coast at the settlement of Itaúnas and then runs southwest, parallel to the coast behind a sand bar, before entering the Atlantic Ocean to the north of Conceição da Barra.
See also List of rivers of Espírito Santo
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