Rodrigo Pinto Guedes, 1st Baron do Rio da Prata (July 27, 1762 in Gradiz, Portugal – June 13, 1845 in Paris) was a naval officer who served in the admiralties of the Kingdom of Portugal, its successor the United Kingdom of Portugal, Brazil and the Algarves, and finally the Empire of Brazil, for which he acted as commander of all naval operations during the Cisplatine War.