The Communist Organization of Spain (Bandera Roja) (Spanish: Organización Comunista de España (Bandera Roja), Catalan: Organització Comunista d'Espanya - Bandera Roja; OCE-BR), commonly known as Bandera Roja (red flag) was a Maoist communist party in Spain. The newspaper of the organization was Bandera Roja.

OCE-BR was founded in 1970 as a split of the PSUC by a sector of its youth wing. The original name was Communist Organization-Red Flag. In 1973 OCE-BR adopted its later name and expanded throughout all Spain. The main goal of the organization was a democratic revolution against the Francoist State, as the first step towards a full socialist revolution.^[1]

OCE-BR was legalized in late 1977. The same year the party suffered a split in Catalonia. The splitters, led by Joan Oms i Llohis, founded the Communist Collective of Catalonia. In 1989 OCE-BR joined the PSUC again, finally disappearing as an organization in 1994.^[2]