Mary O'Connell may refer to:
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Mary O'Connell (nurse), Roman Catholic religious sister and nurse during the American Civil War
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Mary O'Connell (1778–1836), wife of Daniel O'Connell
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Mary J. O'Connell, evolutionary genomicist
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Mary Ellen O'Connell Mary Ellen O'Connell is the Robert and Marion Short Professor of Law at the University of Notre Dame Law School and a research professor of international dispute resolution at Notre Dame's Kroc Institute for International Peace in Studies. Since j ...
, professor of law
{{hndis, Oconnell, Mary