Closed may refer to:

  • Closed (poker), a betting round where no player will have the right to raise
  • Closed (album), 2010 album by Bomb Factory
  • Closed GmbH, German fashion brand


  • A set is closed under a set of operations when applying those operations on its members always results in another member.
    • A set is a closed when it is closed under limits, that is, it contains all its limit points.
      • An interval is closed when it includes its endpoints.


  • In linguistics, a closed class is a class of words or other entities which rarely changes.