Seabrook is a census-designated place (CDP) in the town of Mashpee in Barnstable County, Massachusetts, United States.

[2] Seabrook is located in the southern part of the town of Mashpee along its western border at 41°34′55″N 70°29′55″W / 41.58194°N 70.49861°W / 41.58194; -70.49861 (41.582070, -70.498618).

[3] It is bounded by the town of Falmouth to the west, by Old Ockway Road to the northeast, by a short segment of Red Brook Road and by the Monomoscoy Island CDP to the southeast, and by Hamblin Pond to the south.

According to the United States Census Bureau, the CDP has a total area of 0.35 square miles (0.9 km2), all land.

The racial makeup of the CDP was 99.58% White, 0.21% African American, 0.21% from other races.