Harriet Winsar Isom (born November 4, 1936) is an American retired diplomat. A career Foreign Service Officer, she served as the 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), Isom was born in Heppner, Oregon on November 4, 1936. She graduated from Mills College (B.A., 1958) and the Fletcher School of Law and Diplomacy (M.A.L.D., 1960).