The House of Saxe-Coburg and Gotha (orig. Haus Sachsen-Coburg und Gotha) is a German dynasty, the line of the Saxon House of Wettin that ruled the Ernestine duchies, including the duchy of Saxe-Coburg and Gotha.
Founded by Ernest Anton, the sixth duke of Saxe-Coburg-Saalfeld, it is also the royal house of several European monarchies, and branches currently reign in Belgium through the descendants of Leopold I, and in the Commonwealth realms through the descendants of Prince Albert. Due to anti-German sentiment in the United Kingdom during World War I, George V of the United Kingdom changed the name of his branch from Saxe-Coburg and Gotha to Windsor in 1917.