The Theatre Royal is an Edwardian theatre on Thames Street in Windsor in Berkshire. The theatre has staged numerous productions based on the works by Agatha Christie.
Actress Mary Kerridge and her husband John Counsell ran the theatre from the 1930s until the 1980s. From 1997 the theatre has been managed by Bill Kenwright.
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- 1957, April 15th to April 20th - The Hollow, directed by Joan Riley
- 1957, December 2nd to December 14th - Spider's Web, directed by Joan Riley
- 1972, November 21st to December 9th - The Hollow, directed by Hugh Goldie
- 1979, May 8th to June 2nd - Spider's Web, directed by Hugh Goldie
- 1980, February 5th to March 1st - Black Coffee, directed by Joan Riley
- 1982, July 13th to August 7th - Murder at the Vicarage, directed by Hugh Goldie
- 1983, October 25th to November 19th - Peril at End House, directed by Hugh Goldie
- 1988, May 30th to June 18th - Black Coffee (U.K. tour), directed by Joan Riley
- 1989, July 31st to August 19th - Towards Zero (U.K. tour), directed by Christopher Renshaw
- 1994, February 22nd to March 12th - The Unexpected Guest (Windsor Theatre Company production), directed by Mark Piper
- 2008, April 22nd to May 3rd - Murder on Air (U.K. tour), directed by Joe Harmston
- 2009, January 13th to 24th - Spider's Web (U.K. tour), directed by Joe Harmston
- 2009, November 3rd to December 14th - A Daughter's a Daughter, directed by Roy Marsden
- 2012, January 9th to 21st - Murder on the Nile (U.K. tour), directed by Joe Harmston
- 2014, August 18th to August 23rd - Murder on Air (U.K. tour), directed by Joe Harmston
- 2019, September 30th to October 5th - Murder, Margaret and Me (U.K. tour), directed by Damian Cruden
- 2022, March 22nd to 26th - The Unexpected Guest (U.K. tour), directed by Roy Marsden