The Sound Barrier is a 1952 British aviation drama film directed by David Lean. It is a fictional story about attempts by aircraft designers and test pilots to break the sound barrier. It was David Lean's third and final film with his wife Ann Todd, but it was his first for Alexander Korda's London Films, following the break-up of Cineguild. The Sound Barrier stars Ralph Richardson, Ann Todd, John Justin and Nigel Patrick. It was known in the United States as Breaking Through the Sound Barrier and Breaking the Sound Barrier.

Dorothy Ann Todd was an English film, television and stage actress who achieved international fame when she starred in The Seventh Veil (1945). From 1949 to 1957 she was married to David Lean who directed her in The Passionate Friends (1949), Madeleine (1950), and The Sound Barrier (1952). She was a member of The Old Vic theatre company and in 1957 starred in a Broadway play. In her later years she wrote, produced and directed travel documentaries.