Carloctavismo (Spanish: [kaɾloɣtaˈβismo]; the name appears also as carlosoctavismo, carlooctavismo, carlos-octavismo, carlo-octavismo, or octavismo) is a branch of Carlism, particularly active in the 1943–1953 period. In terms of dynastical allegiances it advanced the claim to the Spanish throne of Carlos Pio de Habsburgo-Lorena y de Borbón, styled as Carlos VIII, and his relatives. In terms of political line it collaborated very closely with Francoism.