Bob Duff (born 1971, Norwalk, Connecticut) is a five-term Democratic member of the Connecticut Senate, representing Norwalk and part of Darien, Connecticut in Connecticut's 25th District since 2001. He previously served as a member of the Connecticut House of Representatives, representing the 137th District. He is currently Majority Leader of the Connecticut Senate, and serves as chair of the Executive and Legislative Nominations Committee and vice chair of the Legislative Management Committee.