Berkeley Square is a play in three acts by John L. Balderston (in collaboration with J.C. Squire) which tells the story of a young American who is transported back to London in the time of the American Revolution and meets his ancestors.^[1] The plot is loosely based on Henry James' posthumous 1917 novel The Sense of the Past.^[2]

The play premiered at the St Martin's Theatre in London's West End in 1926, where it ran for 179 performances.^[3] Its production on Broadway in 1929 was an enormous success with Leslie Howard (who also co-produced and co-directed the play with Gilbert Miller) in the role of time traveler Peter Standish and ran for 229 performances, a substantial run for its time.^[2]

The play was later adapted into a 1933 film version with Howard repeating his stage role of Peter Standish, winning him an Academy Award nomination.^[4] The play was also produced for a 1959 BBC television production and the 1951 film The House in the Square (released in the United States as I'll Never Forget You).^[1][5]

Original London cast

• Tom Pettigrew – Brian Gilmour
• Mr. Throstle – Ivor Barnard  
• The Ambassador – J. Fisher White
• Peter Standish – Lawrence Anderson  
• Maid – Jane Millican/Edith Martyn
• Lady Anne Pettigrew – Beatrice Wilson/Georgina Wynter  
• Miss Pettigrew – Valerie Taylor 
• Helen Pettigrew – Jean Forbes-Robertson 
• Mrs. Barwick – Frances Ruttledge 
• Marjorie Frant – Grizelda Hervey/Juliet Mansell/Jane Millican

Original Broadway cast

• Mrs. Barwick – Lucy Beaumont
• Miss Barrymore – June English
• Marjorie Frant – Ann Freshman
• Helen Pettigrew – Margalo Gillmore
• Tom Pettigrew – Brian Gilmour
• H. R. H. The Duke of Cumberland – Robert Greig
• Maid – Irene Howard
• Peter Standish – Leslie Howard
• The Lady Anne Pettigrew – Alice John
• Mr. Throstle – Tarver Penna
• The Duchess of Devonshire – Louise Prussing
• Major Clinton – Charles Romano
• Kate Pettigrew – Valerie Taylor
• Lord Stanley – Henry Warwick
• The Ambassador – Fritz Williams