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Theatre or theater refers to representational performing arts, and semantically related to a stage.

It may also refer to:

• Theater (structure), the structural building containing stage and audience seating for performances
• Movie theater, a building used to show films to an audience
• Theatrical troupe, a group of actors or acting company

• Theatre (band), a mathcore band from South Africa
• Theatre (album), a 1983 album by George Gruntz
• "The Theatre", a song by the Pet Shop Boys on the 1993 album Very
• "Theater" (song), the German entry to the 1980 Eurovision Song Contest
• Theatre (novel), a 1937 novel by W. Somerset Maugham
• Theatre (film), a 1928 German silent film

• Theater (Metro Rail), a rail station in Buffalo, New York
• Theater (warfare), large geographic area where conflict occurs
• Operating theater (or operating room), a room for carrying out surgical operations
• Pejorative term, in the sense of "an act"(pretense): actions taken by an individual or authority to create the impression of doing something useful or valuable, while achieving little. For example:
  • Security Theater, actions carried out by an authority to give the public the impression of security while doing little or nothing to actually achieving it.
  • Hygiene Theater, the practice of taking hygiene measures that are intended to give the illusion of improved safety while doing little to actually reduce any risk.

• The Theatre, an English playhouse in Shoreditch, London active from 1576, demolished 1598 (timbers used for construction of the original Globe Theatre)
• The Theatre Chipping Norton, Oxfordshire, England
• The Theatre, Leeds, West Yorkshire, England
• Theatre Journal, quarterly academic journal published by the Association for Theatre in Higher Education
• The Theatre (magazine), published in London between 1877 and 1897
• Gaiety Theatre (disambiguation)