William O'Leary is the name of:
- William O'Leary (actor)
- William O'Leary (Irish politician)
- William O'Leary (British Army officer)
- William Hagarty O'Leary, 1874–1880, Member of Parliament
- William James O'Leary, New Zealand prospector
This disambiguation page lists articles about people with the same name.
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