The 189th Massachusetts General Court, consisting of the Massachusetts Senate and the Massachusetts House of Representatives, met in 2015 and 2016 during the governorship of Charlie Baker. Stan Rosenberg served as president of the Senate and Robert DeLeo served as speaker of the House.

The Massachusetts Senate is the upper house of the Massachusetts General Court, the bicameral state legislature of the Commonwealth of Massachusetts. The Senate comprises 40 elected members from 40 single-member senatorial districts in the state. All but one of the districts are named for the counties in which they are located. Senators serve two-year terms, without term limits. The Senate convenes in the Massachusetts State House in Boston, the state capital.