Robert Duff (born 1971 in Norwalk, Connecticut) is an American politician, currently serving as a member of the Connecticut State Senate, where he represents Norwalk and part of Darien in Connecticut's 25th District. 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.