Harwich Port (also spelled Harwichport) is a small seaside community and census-designated place (CDP) situated along Nantucket Sound in the town of Harwich in Barnstable County, Massachusetts, United States. It is named after the port of Harwich in Essex, England. As of the 2010 census, the CDP had a population of 1,644. It is a popular vacation spot on Cape Cod and is home to the Wychmere Beach Club and the Allen Harbor Yacht Club. Also, one of its popular mottos is "Three Harbors, One Port", referencing to Saquatucket, Wychmere, and Allen Harbor, which are all located in Harwich Port. Well known residents include Bill O'Brien, head coach and general manager of the Houston Texans.
Harwich Port is located in the southeastern part of the town of Harwich at 41°40′5″N 70°4′9″W. It is bordered by Nantucket Sound to the south, Northwest Harwich to the west, Harwich Center to the north, East Harwich to the northeast, and the town of Chatham to the east. Saquatucket and Wychmere Harbors are located in Harwich Port. Neighboring Allen Harbor, while having a Harwich Port mailing address, is located in the Northwest Harwich CDP.
According to the United States Census Bureau, the CDP has a total area of 3.5 square miles (9.0 km2).