Barbara O'Neil was an American film and stage actress. She appeared in the film Gone with the Wind (1939) and was nominated for the Academy Award for Best Supporting Actress for her performance in All This, and Heaven Too (1940).

All This, and Heaven Too is a 1940 American drama film released by Warner Bros.-First National Pictures, produced and directed by Anatole Litvak with Hal B. Wallis as executive producer. The screenplay was adapted by Casey Robinson from the 1938 novel by Rachel Field. The music was by Max Steiner and the cinematography by Ernie Haller. The film stars Bette Davis and Charles Boyer with Barbara O'Neil, Jeffrey Lynn, Virginia Weidler, Helen Westley, Walter Hampden, Henry Daniell, Harry Davenport, George Coulouris, Montagu Love, Janet Beecher and June Lockhart.