The Gaiety Theatre was a West End theatre in London, located on Aldwych at the eastern end of the Strand. The theatre was first established as the Strand Musick Hall in 1864 on the former site of the Lyceum Theatre. In 1868, it became known as the Gaiety Theatre and was, at first, known for music hall and then for musical burlesque, pantomime and operetta performances. From 1868 to the 1890s, it had a major influence on the development of modern musical comedy.

Aldwych is a street and the name of the area immediately surrounding it, in the City of Westminster, part of Greater London, and is part of the West End Theatreland. The 450 metres (1,480 ft) street starts 600 metres (2,000 ft) east-northeast of Charing Cross, the conventional map centre-point of the capital city.