Fidel Antonio Castaño Gil Rambo (August 8, 1951 – January 6, 1994) was a Colombian drug lord and paramilitary who was among the founders of Los Pepes and the Peasant Self-Defense Forces of Cordoba and Uraba (ACCU), a paramilitary group which ultimately became a member of the larger United Self-Defense Forces of Colombia (AUC) from which he became its leader until his death in 1994.