Mary J. Ruwart, PhD (born October 16, 1949) is a retired biomedical researcher and libertarian speaker, writer, and activist. She was a leading candidate for the 2008 Libertarian Partypresidential nomination and is the author of the award-winning Healing Our World.
In 1992, Ruwart published her book Healing Our World: The Other Piece of the Puzzle (ISBN 0-9632336-2-9); in 2003, the third edition was published, retitled Healing Our World in an Age of Aggression (ISBN 0-9632336-6-1). In the afterword of the third edition of Healing Our World, Ruwart describes the experience of her sister's death, an assisted suicide facilitated by Jack Kevorkian.
In March 2008, in response to an informal draft effort by a group of Libertarian Party activists, Ruwart announced her candidacy for the Libertarian presidential nomination in the 2008 election. She lost the nomination to Bob Barr on the sixth ballot at the 2008 Libertarian National Convention on May 25, 2008. Despite tying with Barr on the third and fourth ballots and taking the lead on the fifth, she ultimately lost after third-placed candidate Wayne Allyn Root threw his support behind Barr. Root later received the vice-presidential nomination.