List of Famous people named William

William Squire was a Welsh actor of stage, film and television.

William Tepper was an American actor and screenwriter, best known for his lead role in Jack Nicholson's directorial debut, Drive, He Said (1971).

William O'Dwyer was an Irish-American politician and diplomat who served as the 100th Mayor of New York City, holding that office from 1946 to 1950.

William McDougall FRS was an early 20th century psychologist who spent the first part of his career in the United Kingdom and the latter part in the United States. He wrote a number of highly influential textbooks, and was particularly important in the development of the theory of instinct and of social psychology in the English-speaking world. He was an opponent of behaviourism and stands somewhat outside the mainstream of the development of Anglo-American psychological thought in the first half of the 20th century; but his work was very well-known and respected among lay people.