Rodrigo Pinto Guedes, Baron of Rio da Prata (27 July 1762 – 13 June 1845) was a Portuguese-born Brazilian 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.

Guedes was born in the freguesia of Gradiz, Aguiar da Beira, on 27 July 1762 to Rodrigo Pinto Guedes and Maria da Silveira Pereira.

His parents intended him to take on a religious life, and sent him to a monastery; however, he ran away and decided to embark on a maritime career.

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