Mary Sullivan may refer to:
- Mary Sullivan (murder victim) (1944-1964), American victim in the Boston Strangler case
- Mary Sullivan (netball) (1920–1977), New Zealand netball player
- Mary A. Sullivan (1878/1879–1950), American police detective
- Mary Ann Sullivan (born 1959), American politician (former member of the Indiana House of Representatives)
- Mary Gail Sullivan (born 1952), American former rugby union player
- Mary Quinn Sullivan (1877–1939), American art collector
- Mary Sullivan (politician), member of the Vermont House of Representatives
See also
- Mary Kenney O'Sullivan (1864–1943), organizer in the early U.S. labor movement
- Mary Josephine Donovan O'Sullivan (1886–1966), professor of history
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