Thomas O'Brien

Thomas O'Brien is the name of the following people:

• Thomas O'Brien (Bishop) (1792–1874), Irish clergyman, Bishop of Ossory, Ferns and Leighlin
• Thomas J. O'Brien (diplomat) (1842–1933), American diplomat
• Thomas J. O'Brien (politician) (1878–1964), American politician
• Thomas J. O'Brien (Bishop) (1935–2018), American priest, Bishop of Phoenix
• Thomas Kevin O'Brien (1923-2004), English Catholic bishop

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