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.

The House of Saxe-Coburg and Gotha is a European royal house. It takes its name from its oldest domain, the Ernestine duchy of Saxe-Coburg and Gotha, and its members later sat on the thrones of Belgium, Bulgaria, Portugal, and the United Kingdom and its dominions.