Nancy Kelly (Lowell, Massachusetts, 25 de març de 1921 − Bel-Air, Los Angeles, Califòrnia, 2 de gener de 1995) va ser una actriu estatunidenca que va rodar 36 pel·lícules entre 1926 i 1977. Era la germana més gran de l'actor Jack Kelly, estrella de la sèrie televisiva de 1957 Maverick. Kelly va ser una estrella infantil, que havia fet tantes pel·lícules quan tenia només nou anys, que el Film Daily la va anomenar la nena més fotografiada d'Amèrica en posat comercial. Ja com a actriu adulta, va guanyar en dues ocasions el Premi Sarah Siddons pel seu treball en l'ambient teatral de Chicago, així com un Tony.

Nancy Kelly (March 25, 1921 – January 2, 1995) was an American actress. A child actress and model, she was a repertory cast member of CBS Radio's The March of Time and appeared in several films in the late 1920s. She became a leading lady upon returning to the screen in the late 1930s, while still in her teens, and made two dozen movies between 1938 and 1946, including portraying Tyrone Power's love interest in the classic Jesse James (1939), and playing opposite Spencer Tracy in Stanley and Livingstone later that same year.

After turning to the stage in the late 1940s, she had her greatest success in a character role, the distraught mother in The Bad Seed, receiving a Tony Award for Best Actress in a Play for the 1955 stage production and an Academy Award nomination as Best Actress for the 1956 film adaptation, her last film role. Kelly then worked regularly in television until 1963, then took over the role of Martha in the original Broadway production of Who's Afraid of Virginia Woolf? for several months. She returned to television for a handful of appearances in the mid-1970s.

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