The Duke of York's Theatre is a West End theatre in St Martin's Lane, in the City of Westminster, London. It was built for Frank Wyatt and his wife, Violet Melnotte, who retained ownership of the theatre until her death in 1935. Designed by the architect Walter Emden, it opened on 10 September 1892 as the Trafalgar Square Theatre, and was renamed to Trafalgar Theatre in 1894. The following year, it became the Duke of York's to honour the future King George V.

The theatre's opening show was comic opera The Wedding Eve by Frédéric Toulmouche. One of the earliest musical comedies, Go-Bang, was a success at the theatre in 1894. In 1900, Jerome K. Jerome's Miss Hobbs was staged as well as David Belasco's Madame Butterfly, which was seen by Puccini, who later turned it into the famous opera. This was also the theatre where J. M. Barrie's Peter Pan, or The Boy Who Wouldn't Grow Up debuted on 27 December 1904. Many famous British actors have appeared here, including Basil Rathbone, who played Alfred de Musset in Madame Sand in June 1920, returning in November 1932 as the Unknown Gentleman in Tonight or Never.