Pierre de Lagarde Boal (September 29, 1895, Thonon-les-Bains, Haute-Savoie, France – May 24, 1966, Neuilly-sur-Seine, France) was an American diplomat and aviator.[1] Boal served as the United States Ambassador to Nicaragua from 1941 to 1942 and the United States Ambassador to Bolivia from May 1942 to February 5, 1944.[1]