The Novello Theatre is a West End theatre on Aldwych, in the City of Westminster. It was known as the Strand Theatre between 1913 and 2005. The musical Mamma Mia! opened in the West End at the Novello Theatre on September 2012. Directed by Phyllida Lloyd with choreography by Anthony Van Laast, the original cast featured Siobhan McCarthy, Lisa Stokke, and Hilton McRae. Mamma Mia! is a jukebox musical written by British playwright Catherine Johnson, based on songs recorded by Swedish group ABBA and composed by Benny Andersson and Björn Ulvaeus, members of the band.

The theatre was built as one of a pair with the Aldwych Theatre on either side of The Waldorf Hilton, London, both being designed by W. G. R. Sprague. The theatre was opened by The Shubert Organization as the Waldorf Theatre on 22 May 1905, and was renamed the Strand Theatre, in 1909. It was again renamed as the Whitney Theatre in 1911, before again becoming the Strand Theatre in 1913. In 2005, the theatre was renamed by its owners (Delfont Mackintosh Theatres) the Novello Theatre in honour of Ivor Novello, who lived in a flat above the theatre from 1913 to 1951.

The black comedy Arsenic and Old Lace had a run of 1337 performances here in the 1940s, and Sailor Beware! ran for 1231 performances from 1955. Stephen Sondheim's musical A Funny Thing Happened on the Way to the Forum opened here in 1963, running for nearly two years. In 1971, the comedy No Sex Please, We're British opened here, remaining for over 10 years of its 16-year run until it transferred to the Garrick Theatre in 1982.

The theatre was extensively refurbished in 1930 and again in the early 1970s. It was Grade II listed by English Heritage on 20 July 1971. After The Rat Pack: Live from Las Vegas in 2005, its 100th anniversary year, the theatre was extensively refurbished. The current seating capacity is 1,105.

The theatre reopened on 8 December 2005 with the Royal Shakespeare Company (RSC)'s annual London season, playing to 4-week runs of Twelfth Night, The Comedy of Errors, A Midsummer Night's Dream and As You Like It, concluding in March 2006.

In 2006, the theatre played host to the London première of the Broadway musical Footloose, starring Cheryl Baker. Ending on 11 November, Footloose made way for the Royal Shakespeare Company's return season for 2006–7, following which the Broadway musical The Drowsy Chaperone made its European première on 6 June 2007. The London production starred Elaine Paige, Bob Martin, Summer Strallen and John Partridge. The London production closed after a run of only two months on 4 August 2007 after failing to attract audiences, despite positive notices.

It was announced on 10 July 2007, just three days after the announcement of Drowsy's premature closure that the theatre would be the home of a new musical version of the MGM motion picture Desperately Seeking Susan with music by Blondie and Deborah Harry, directed by Angus Jackson, and starring Emma Williams and Kelly Price. The musical previewed on 16 October 2007 (originally 12 October 2007), receiving its world première on 15 November 2007. However, just two weeks after its opening, following a critical mauling, the show announced its final performance for 15 December 2007, having played just four weeks of previews and four weeks of open run, losing over £3.5 million.

A quick replacement came in the form of the cross-West End transfer of Shadowlands from the Wyndham's Theatre, commencing 21 December 2007 for a 12-week run to 25 February 2008. Producer Phil McIntyre opened ZooNation's adaptation of the musical Into the Woods, entitled Into the Hoods, on 26 March 2008.