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Theatre or theater (from French "théâtre", from Greek "theatron", θέατρον) is the branch of the performing arts concerned with acting out stories in front of an audience using combinations of speech, gesture, mime, music, dance, sound and spectacle — indeed any one or more elements of the other performing arts. In addition to the standard narrative dialogue style, theatre takes such forms as opera, ballet, mime, kabuki, classical Indian dance, Chinese opera, mummers' plays, improv and pantomime.

• For people involved in theatre, see Category:Theatrical occupations
• Most organisations can be found in Category:Theatres and Category:Theatre companies