Barbara Bain (born 13 September 1931) is an American actress.

Bain was born Millicent Fogel in Chicago, Illinois. She graduated from the University of Illinois with a Bachelor's Degree in Sociology and moved to New York City where she was a dancer and high fashion model. Bain studied with Martha Graham, thus cementing her interest in dancing. After attending Lee Strasberg's Actors' Studio, she became an actress.

Bain is best known for her work in the television series Mission: Impossible as Cinnamon Carter, as whom she appeared from 1966 until 1969. Bain later appeared in one episode of Diagnosis: Murder. She was nominated for a Golden Globe Award for 'Actress in a Television Series' for her performance in Mission: Impossible in 1968. She won three consecutive Emmys for Best Dramatic Actress for that series, in 1967, 1968, 1969. Her husband, Martin Landau, also starred in the series, and her departure from the series in 1969 coincided with his. Later, she starred opposite Landau again in the science fiction television series, Space: 1999 (1975-1977), as Dr. Helena Russell. Bain and Landau also performed together on screen in the 1981 made-for-TV film The Harlem Globetrotters on Gilligan's Island.

Bain appeared in the tenth episode of the TV series My So-Called Life, playing Angela Chase's grandmother.

In 2006, Bain had a minor role in an episode of CSI: Crime Scene Investigation ("Living Legends") which featured a suspect, played by another actor, who used stretch rubber face masks similar to those used in the old Mission: Impossible series in which Bain starred.

Bain has worked to further the cause of many charities, including literacy.

Barbara Bain was born in Chicago, graduating from the University of Illinois with a Bachelor's Degree in Sociology. She then relocated to New York City where she gained work as a dancer and high-fashion model. Ms. Bain studied with Martha Graham, permanently cementing her love of dance; however, it was with Lee Strasberg at the prestigious Actors Studio that she discovered her true first love - acting. She is probably best known for her work in the landmark television series "Mission: Impossible" (1966), created by Bruce Geller (I), where she created the pivotal role of Impossible Missions Force Agent "Cinnamon Carter", and, in the process, became the first actress in the history of television to receive three consecutive Emmy Awards for Best Dramatic Actress. Ms. Bain followed with the role of "Dr. Helena Russell" in the now classic British syndicated science fiction television series "Space: 1999" (1975), created by Gerry Anderson (I) and Sylvia Anderson (I). Her stage work has garnered her Los Angeles Critic's Circle and DramaLogue Awards for her work on Arthur L. Kopit's "Wings", Samuel Beckett's "Happy Days" and Eugène Ionesco's "The Chairs". Ms. Bain has worked on behalf of numerous charitable causes and is the founder of the Screen Actors Guild's "BookPals" Program which currently has some 300 of her colleagues reading to children in Los Angeles schools. Following the success of the program there, she helped the program to develop in other major cities throughout North America.