The Theatre Royal Haymarket is a West End theatre in the Haymarket in the City of Westminster which dates back to 1720, making it the third-oldest London playhouse still in use. Samuel Foote acquired the lease in 1747, and in 1766 he gained a royal patent to play legitimate drama in the summer months. The original building was a little further north in the same street. It has been at its current location since 1821, when it was redesigned by John Nash. It is a Grade I listed building, with a seating capacity of 888. The freehold of the theatre is owned by the Crown Estate.
The Haymarket has been the site of a significant innovation in theatre. In 1873, it was the venue for the first scheduled matinée performance, establishing a custom soon followed in theatres everywhere. Its managers have included Benjamin Nottingham Webster, John Baldwin Buckstone, Squire Bancroft, Cyril Maude, Herbert Beerbohm Tree, and John Sleeper Clarke, brother-in-law of John Wilkes Booth, who quit America after the assassination of Abraham Lincoln. Famous actors who débuted at the theatre included Robert William Elliston and John Liston.