A Timeless West End Venue Home to the World’s Longest-Running Play

St Martin’s Theatre is a jewel of Edwardian theatre design and home to the world-famous production of Agatha Christie’s The Mousetrap. Located in the heart of Seven Dials, this venue has become synonymous with classic mystery, intimate stagecraft, and theatrical tradition. With a capacity of around 550, it offers one of the most personal theatre experiences in London’s West End.

History and Construction

The theatre was designed by W.G.R. Sprague and opened in 1916. Though World War I delayed construction, it officially opened in 1916 with a performance of Houp La!. For many years, it hosted a variety of plays and musical revues before being forever changed by a certain murder mystery in 1974. The building was designated a Grade II-listed property in 1973, preserving its beautifully detailed auditorium and classic proscenium arch stage.

Iconic Legacy of The Mousetrap

The Mousetrap opened next door at the Ambassadors Theatre in 1952 and transferred to St Martin’s in 1974. Since then, it has played continuously, becoming the world’s longest-running theatrical production. Generations of actors have taken part in the show’s tradition, which includes a request to audiences not to reveal the ending. The show has become a London institution, drawing audiences from around the globe.

Architecture and Audience Experience

The theatre’s three-level layout features richly upholstered seating, wooden panelling, and Edwardian light fixtures. Its compact size gives every patron a close-up view of the stage, and its traditional layout is perfect for storytelling-heavy performances. Though compact, it offers updated amenities including bar service and digital ticketing.

Location and Access

Situated on West Street, just a few steps from Cambridge Circus, St Martin’s is within easy walking distance of Leicester Square and Covent Garden. Though the venue retains its historic structure, access has been improved in recent years with enhanced facilities for those with mobility needs.

Enduring Appeal

St Martin’s Theatre is a cornerstone of West End heritage — intimate, atmospheric, and tied to one of the most iconic stories in theatre history. It’s not just a venue; it’s a piece of living cultural legacy.