The longest-running West End show is Agatha Christie's The Mousetrap , which has been running continuously since 1952, making it over 73 years old with more than 28,000 performances. It holds the record as the longest-running play in the world and is performed at St Martin's Theatre

. For musicals, the longest-running is Les Misérables , which has been running since 1985, over 40 years, with more than 15,000 performances. It is currently staged at the Sondheim Theatre and is the longest-running musical in the West End

. Other notable long-running West End shows include:

• The Phantom of the Opera (since 1986)
• Mamma Mia! (since 1999)
• The Lion King (since 1999)
• Wicked (since 2006), which recently became the 10th longest-running West End show as of April 2024

In summary:

• Longest-running play: The Mousetrap (73+ years)
• Longest-running musical: Les Misérables (40+ years)