In 1932 Wallace Beery and Frederic March both won Best Actor, for The Champ and Dr. Jeckell and Mr. Hyde, respectively.
In 1968 Katharine Hepburn and Barbra Streisand both won Best Actress, for A Lion in Winter and Funny Girl, respectively.
Most recently, in 2013, there was a tie for the Sound Editing oscar. Skyfall and Zero Dark Thirty both won the award.
In 1932 Wallace Beery and Frederic March both won Best Actor, for The Champ and Dr. Jeckell and Mr. Hyde, respectively.
In 1968 Katharine Hepburn and Barbra Streisand both won Best Actress, for A Lion in Winter and Funny Girl, respectively.
Most recently, in 2013, there was a tie for the Sound Editing oscar. Skyfall and Zero Dark Thirty both won the award.
Hmm...not unprecedented but only happens every four and a half decades... confused