Mary Jo Kilroy (born April 30, 1949) is an American attorney and politician who served as the U.S. representative for Ohio's 15th congressional district from 2009 until 2011. She is a member of the Democratic Party from Ohio. She was defeated in her November 2, 2010 re-election bid. In 2012, she ran in the newly redrawn, Columbus-based 3rd congressional district but lost in the primary.