Liam O'Brien (born 1976) is an 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
See also Liam Ó Briain (1888–1974), Irish language expert and political activist List of people with given name Liam