Denis O'Leary was an American educator, lawyer, and politician who served as Queens County district attorney and for one year as a member of the United States House of Representatives from New York, from 1913 to 1914.
- Occupation
- politician, lawyer
- Position held
- United States representative
- Citizenship
- United States
- Born
- January 22, 1863
- Died
- September 27, 1943