Stanley C. Rosenberg 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.

The president of the Massachusetts Senate is the presiding officer. Unlike the United States Congress, in which the vice president of the United States is the ex officio president of the United States Senate, in Massachusetts, the president of the Senate is elected from and by the senators. The president, therefore, typically comes from the majority party, and the president is then the de facto leader of that party.