What Every Woman Knows (1934) is an American romantic comedy film directed by Gregory La Cava and starring Helen Hayes, Brian Aherne and Madge Evans. The film was produced and distributed by Metro-Goldwyn-Mayer and is based on the play What Every Woman Knows (1908) by J. M. Barrie. It was filmed by Paramount back in the silent era in 1921 and starred Lois Wilson. An even earlier British silent version was filmed in 1917. Hayes was familiar with the material as she had starred in a 1926 Broadway revival opposite Kenneth MacKenna.