Gerard O'Brien

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