Harriet Winsar Isom (born November 4, 1936, Heppner, Oregon) is a retired Career Foreign Service Officer who was Chargé d'Affaires ad interim to Laos (August 1986-August 1989) and Ambassador to Benin (January 26, 1990 – November 14, 1992) and Cameroon (August 17, 1992 – January 15, 1996), During Isom's tenure in Laos, an agreement was reached regarding US aide to Laos and Laos looking for Americans who had been missing since the Vietnam War. Isom graduated from Mills College (B.A., 1958) and the Fletcher School of Law and Diplomacy (M.A.L.D., 1960).