Massachusetts Senate's Cape and Islands district in the United States is one of 40 legislative districts of the Massachusetts Senate. It covers 66.7% of Barnstable County, all of Dukes County, and all of Nantucket County population in 2010. Democrat Julian Cyr of Truro has represented the district since 2017. He ran unopposed for re-election in the 2020 Massachusetts general election.
The district includes the following localities:
The current district geographic boundary overlaps with those of the Massachusetts House of Representatives' 1st Barnstable, 2nd Barnstable, 3rd Barnstable, 4th Barnstable, 5th Barnstable, and Barnstable, Dukes & Nantucket districts.