William Smith Culbertson (August 5, 1884 – August 12, 1966) was an American diplomat and soldier. U.S. Ambassador, Romania, 1925–1928, Chile, 1928 - 1933. Colonel, United States Army. President, United States Tariff Commission 1922 - 1925. Member, United States Tariff Commission, 1916–1922, American Bar Association, Council on Foreign Relations, American Economic Association, Phi Alpha Delta, Phi Beta Kappa.