Munson moved to Los Angeles in 1930, and appeared in the Warner Bros. movie Going Wild.
Originally, this film was intended as a musical, but all the numbers were removed before release owing to the public's distaste for musicals, which virtually saturated the cinema in 1929-30.
The following year, she divorced Buzzell.
After the divorce, Munson had a brief affair with filmmaker Ernst Lubitsch before his marriage to Vivian Gaye.

Munson appeared the next year in The Hot Heiress, in which she sings several songs along with her co-star Ben Lyon.
She also starred in Broadminded (1931) and Five Star Final (1931).
After completing these films, Munson returned to New York and resumed her theater career, starring in Broadway productions of Hold Your Horses (1933), followed by Petticoat Fever and  Henrik Ibsen's Ghosts (both staged in 1935), in the latter of which she portrayed Regina Engstrand.
During rehearsals for Ghosts, Munson had a short-lived romantic affair with actress Alla Nazimova, which ended before the play's premiere.
Co-star Harry Ellerbe stated that the couple had "parted amicably."

Munson returned to Los Angeles in 1938 to appear a minor part in His Exciting Night, followed by an uncredited role in Dramatic School.
When David O. Selznick began casting his production Gone with the Wind, he first announced that Mae West was to play Belle, but both West and Tallulah Bankhead refused the role as too small.
Munson was the antithesis of the voluptuous Belle: freckled and of slight build—but Selznick cast her in the role.

Munson’s career was stalemated by the acclaim of Gone with the Wind; for the remainder of her career, she was typecast in similar roles.
In 1940, Munson had an affair with playwright Mercedes de Acosta while working for Republic Pictures in Los Angeles.
Their affair was intense, with Munson once writing to Acosta in a letter: "I long to hold you in my arms and pour my love into you."
Munson moved to Los Angeles in 1930, and appeared in the Warner Bros. movie Going Wild. Originally, this film was intended as a musical, but all the numbers were removed before release owing to the public's distaste for musicals, which virtually saturated the cinema in 1929-30. The following year, she divorced Buzzell. After the divorce, Munson had a brief affair with filmmaker Ernst Lubitsch before his marriage to Vivian Gaye.
Munson appeared the next year in The Hot Heiress, in which she sings several songs along with her co-star Ben Lyon. She also starred in Broadminded (1931) and Five Star Final (1931). After completing these films, Munson returned to New York and resumed her theater career, starring in Broadway productions of Hold Your Horses (1933), followed by Petticoat Fever and  Henrik Ibsen's Ghosts (both staged in 1935), in the latter of which she portrayed Regina Engstrand. During rehearsals for Ghosts, Munson had a short-lived romantic affair with actress Alla Nazimova, which ended before the play's premiere. Co-star Harry Ellerbe stated that the couple had "parted amicably."
Munson returned to Los Angeles in 1938 to appear a minor part in His Exciting Night, followed by an uncredited role in Dramatic School. When David O. Selznick began casting his production Gone with the Wind, he first announced that Mae West was to play Belle, but both West and Tallulah Bankhead refused the role as too small. Munson was the antithesis of the voluptuous Belle: freckled and of slight build—but Selznick cast her in the role. 
Munson’s career was stalemated by the acclaim of Gone with the Wind; for the remainder of her career, she was typecast in similar roles. In 1940, Munson had an affair with playwright Mercedes de Acosta while working for Republic Pictures in Los Angeles. Their affair was intense, with Munson once writing to Acosta in a letter: "I long to hold you in my arms and pour my love into you."
Ona Munson