Communist Left of Spain (in Spanish: Izquierda Comunista de España) was a Trotskyist political party during the Second Spanish Republic. Its central leader was Andres Nin, who had been a supporter of the Left Opposition while living in Russia. Although the group was affiliated to the International Left Opposition, Leon Trotsky objected to its name, believing that it failed to stress that the organisation viewed itself as an external faction of the Communist Party. It eventually merged with the Right Opposition communist party Bloque Obrero y Campesino, to form the Workers' Party of Marxist Unification (POUM). Its General Secretary was Andreu Nin i Pérez.