Thomas O'Hagan, 1st Baron O'Hagan, KP, PC (Ire), QC, was an Irish lawyer and judge. He served as Lord Chancellor of Ireland from 1868 to 1874 and again from 1880 to 1881.
- Occupation
- judge, politician
- Position held
- Lord Chancellor of Ireland, Member of the Privy Council of Ireland, member of the 18th Parliament of the United Kingdom
- Citizenship
- Ireland, United Kingdom of Great Britain and Ireland
- Born
- May 29, 1812
- Died
- February 1, 1885