Liam O'Brien (disambiguation)

Liam O'Brien (born 1976) is American voice actor and voice director.

Liam O'Brien may also refer to:

• Liam O'Brien (Irish actor), Irish actor
• Liam O'Brien (athlete) (born 1954), Irish Olympic athlete
• Liam O'Brien (footballer, born 1964), Irish international football player
• Liam O'Brien (footballer, born 1991), English football player
• Liam O'Brien (hurler) (born 1950), former Irish hurler
• Liam O'Brien (ice hockey) (born 1994), Canadian ice hockey player
• Liam O'Brien (screenwriter) (1913–1996), American screenwriter and television producer