Agustín Arturo Prat Chacón (April 3, 1848, near Ninhue, Chile – May 21, 1879, Iquique, Peru) was a Chilean lawyer and navy officer. He was killed shortly after boarding the Peruvian armored monitor Huáscar at the Naval Battle of Iquique after the ship under his command, the Esmeralda, was rammed by the Peruvian monitor. Prat, as captain of the Esmeralda, was the first to board the Huáscar.