New Seabury is a census-designated place in the town of Mashpee in Barnstable County, Massachusetts, United States, on Cape Cod. The area consists primarily of summer homes for wealthy families. Attractions include a county club and the Fells Pond, Daniels Island, and Littleneck Bay neighborhoods. The population of the CDP was 717 at the 2010 census. The community is located on the historic home of the Wampanoag Nation.