Mary Marsh (born 1946) is a British former charity worker.
Mary Marsh may also refer to:
Mae Marsh (Mary Wayne Marsh, 1894–1968), American film actress Mary A. Marsh (born 1930), United States Air Force general Mary Buff (1890–1970), née Marsh, children's illustrator Mary Butcher (1927–2018), later Marsh, All-American Girls Professional Baseball League player
Fictional characters Mary Marsh, in the 1930 American pre-Code slapstick comedy film Hook, Line and Sinker Mary Marsh, in the American serial political drama TV series The West Wing episode "Pilot"
See also St Mary in the Marsh, village in Kent, England