Gerard O'Brien or Ger O'Brien may refer to:
- Ger O'Brien (born 1984), former Irish professional footballer
- Gerard O'Brien (cricketer) (born 1942), former Irish cricketer
- Gerard O'Brien (judge) (born 1964), Irish judge
- Gray O'Brien (born Gerard O'Brien, 1968), Scottish actor
This disambiguation page lists articles about people with the same name.
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