William Howard Taft III (August 7, 1915 - February 23, 1991) was the grandson of William Howard Taft and served as U.S. ambassador to the Republic of Ireland from 1953 to 1957. His task was made easier by the fact that John A. Costello, Taoiseach 1954-57 was a personal friend; Taft described Costello as "pleasant and unassuming" whereas he had found Éamon de Valera "formal and aloof". Taft played a considerable part in organising Costello's successful State visit to the United States in March 1956. Taft was also a member of the Metropolitan Club of Washington D.C. until at least the mid-1980s, perhaps later. Taft was the father of William Howard Taft IV.