Stanley C. Rosenberg (born October 12, 1949) is an American politician who served as President of the Massachusetts Senate from January 2015 until December 2017. Rosenberg was elected to the Massachusetts House of Representatives in 1986 and served as the representative for Amherst and Pelham until 1991 when he won a special election for the State Senate seat being vacated by Congressman John Olver. A Democrat, Rosenberg resigned from the Senate on May 4, 2018, amidst a sexual harassment scandal involving his husband, Bryon Hefner.