Matthew A. Brown (born November 15, 1969) is an American attorney, activist, and politician who served as secretary of state of Rhode Island from 2003 to 2007. Brown was a Democratic candidate for governor of Rhode Island in the 2018 election. Alongside Bruce G. Blair, Brown co-founded Global Zero, a non-profit international initiative for the phased, verified elimination of all nuclear weapons worldwide. He previously served as executive director of the Rhode Island branch of City Year.