Marcella Martin (June 5, 1916 – October 31, 1986) was an American actress, remembered for her role as Cathleen Calvert in Gone with the Wind (1939).

She appeared at auditions held at The Shreveport Little Theatre, where she was found by Hollywood agents who were Searching for Scarlett.

Martin was screen-tested for playing Scarlett O'Hara in David O. Selznick's Gone with the Wind and was for some weeks a leading candidate for the role.

Marcella Martin later played love interests to the leading role in the Columbia Pictures movies West of Tombstone (1942) and The Man Who Returned to Life (1942).

In the 1960s she appeared in a supporting role in the film Voyage to the End of the Universe (1964) and played Ruth Collier in the episode Boomerang of the television series The F.B.I.. Marcella Martin was married three times.