Prince Peter August of Saxe-Coburg and Gotha, known in Brazil as Dom Pedro Augusto, was a prince of the Empire of Brazil and of the House of Saxe-Coburg and Gotha-Koháry. The favorite grandson of Emperor Pedro II, he was known as "the Preferred".

The House of Saxe-Coburg and Gotha-Koháry is the Catholic cadet branch of the House of Saxe-Coburg and Gotha, founded after the marriage of Prince Ferdinand of Saxe-Coburg and Gotha and Princess Maria Antonia Koháry de Csábrág. Among its descendants were the last four kings of Portugal and the last three Tsars of Bulgaria. After the change of the “House laws” by King Simeon, the present head of the house is his sister Princess Marie Louise of Bulgaria, Princess of Koháry.