Regent's Park Open Air Theatre, in the City of Westminster, London, is a permanent venue with an annual sixteen-week summer season. It was founded in 1932 by Sydney Carroll and Robert Atkins.

The theatre is located in Queen Mary's Gardens, on the inner-circle of Regent's Park and consequently is surrounded entirely by parkland. It is completely uncovered; the only sheltered area being underneith the tiered auditorium, which houses one of the longest bars of any theatre in London — stretching the entire length of the seating. The bar serves full meals from one and a half hours before performances begin and remains open for light refreshments until midnight. A barbecue is also provided as well as a picnic lawn with tables for the audience to bring their own food.
The Auditorium

The theatre houses an extensive backstage area complete with green room for the company and technical team, a full wardrobe, makeup and wigs department, a workshop and paintshop for the creation and maintenance of stage sets and numerous offices for stage management, sound, LX and other crew.

Being open air, performances are dependent on the not-so dependable British weather. In the case of wet weather, the Met Office is called to determine the immediate forecast. Shows cannot be held for longer than 45 minutes, especially in the case of matinees as the delayed finish will dramatically interfere with the technical preparations for the evening show.

The theatre is a registered charity, run by an Artistic Director and CEO, and a Board of Trustees, Chaired by Councillor Robert Davis DL, and including Sir Peter Rogers, David Conville and Dame Judi Dench.