El Mono Azul (Spanish: Blue Overalls) was an anti-fascist magazine which was published in Madrid during the Spanish Civil War. The magazine existed between 1936 and 1939 and was one of the major cultural, intellectual and artistic publications during the war with the subtitle hoja semanal de la Alianza de Intelectuales Antifascista para la Defensa de la Cultura (Spanish: Weekly publication of the Alliance of Anti-fascist Intellectuals for the Defense of Culture).