William O'Neill

William O'Neill is the name of the following people:

• William O'Neill (badminton) , Irish badminton player
• William A. O'Neill ( William Atchison O'Neill ; 1930-2007), American politician
• William L. O'Neill ( William Lawrence O'Neill ; 1935-2016), American historian
• William P. O'Neill (1874–1955), American politician

This is a disambiguation page for differentiating between several terms identified with the same word.