51 may refer to:
* 51 (number)
* The year
** 51 BC
** AD 51
** 1951
** 2051
* 51 (film), ''51'' (film), a 2011 American horror film directed by Jason Connery
* "Fifty-One", an episode of the American television drama series ''Breaking Bad''
* 51 (album), ''51'' (album), a 2012 mixtape by rapper Kool A.D.
* "Fifty One", a song by Karma to Burn from the album ''V (Karma to Burn album), V'', 2011
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