Marguerite "Maggie" McNamara (June 18, 1928 – February 18, 1978) was an American actress and model.
McNamara began her career as a teenage fashion model, soon becoming one of the most successful models of the 1940s. Her photos were published in magazines like Vogue and Harper's Bazaar. In March 1948 she appeared on the cover of Life Magazine. This attention led to offers for film roles, which she initially rejected. She gained recognition as an actress in the controversial film The Moon Is Blue directed by Otto Preminger, reprising the role she played in the Chicago production of the play. She earned an Academy Award nomination for Best Actress for her role in the film.
By the mid-1950s, McNamara's mental health began to decline. She appeared in two films after The Moon Is Blue and made her final film in 1963. After five guest-starring roles in television series in early 1960s, she retired from acting. For the remainder of her life, she worked as a typist in New York City. In February 1978, McNamara died of a barbiturate overdose at the age of 49.