Thomas O'Neill
Thomas or Tom O'Neill may refer to:
- Thomas O'Neill (Wisconsin politician), member of the Wisconsin State Assembly from Milwaukee Co
- Thomas J. O'Neill, American merchant
- Thomas O'Neill (Canadian politician), Canadian politician, member of parliament for Kamloops
- Thomas F. O'Neill, American art director
- Thomas O'Neill (journalist), American writer for the Baltimore Sun
- Tip O'Neill, American politician
- Thomas P. O'Neill (historian), Irish historian
- Tom O'Neill (ice hockey), Canadian ice hockey player
- Thomas Newman O'Neill Jr., United States federal judge
- Thomas P. O'Neill III, American politician and leader of a public relations and government affairs firm
- Tommy O'Neill, Scottish footballer