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 (the "Cape and Islands" district covers Dukes, Nantucket, and parts of Barnstable counties). Senators serve two-year terms, without term limits. The Senate convenes in the Massachusetts State House in Boston, the state capital.

The following are the qualifications to be elected to the Massachusetts Senate:

Democrats hold a supermajority in the Senate.

Massachusetts Senate districts are named for the counties that contain a portion of the district ordered by percentage of the district's population that is within that county. If multiple districts would have the same name under this scheme, they are also given an ordinal number. The one exception is "Cape and Islands" which if the naming scheme were followed would be "Barnstable, Dukes, and Nantucket".