Isobel Lennart was an American screenwriter and playwright.
A native of Brooklyn, New York, Lennart moved to Hollywood, where she was hired to work in the MGM mail room, a job she lost when she attempted to organize a union. She joined the Communist Party in 1939 but left five years later.
Lennart's first script, The Affairs of Martha, an original comedy about the residents of a wealthy community who fear their secrets are about to be revealed in an exposÃ© written by one of their maids, was filmed in 1942 with Spring Byington, Marjorie Main, and Richard Carlson. This was followed in quick succession by A Stranger in Town, Anchors Aweigh, and It Happened in Brooklyn.
In 1947, the House Un-American Activities Committee began an investigation into the motion picture industry. Lennart, who had been blacklisted due to her left-wing leanings, was called to tesitify and named twenty-one individuals she knew had been members of the Communist Party, thus saving her own career.
Lennart's later screen credits include A Life of Her Own, Love Me or Leave Me, Merry Andrew, The Inn of the Sixth Happiness, Please Don't Eat the Daisies, The Sundowners, and Two for the Seesaw.