Dennis Port (or Dennisport) is a census-designated place (CDP) in the town of Dennis in Barnstable County, Cape Cod, Massachusetts. At the 2010 census, its population was 3,162.
The Swan Pond River and Upper County Road demarcate Dennis Port's western border with West Dennis. The village of West Harwich lies directly to Dennis Port's east, with the border demarcated by the median of Division Street. To the north of Dennis Port is South Dennis. Like other villages along Nantucket Sound, Dennis Port features warm-water beaches, like Haigis Beach, Sea Street Beach, and Glendon Road Beach. Many consider these among Cape Cod's most desirable beaches for swimming and windsurfing.
By U.S. standards, real estate prices in Dennis Port remain high. Housing stock consists mostly of World War II–era beach cottages built in the Cape Cod architectural style, although many have been expanded or replaced with larger, more contemporary beach houses. Many streets in Dennis Port—particularly those south of Lower County Road, within 0.5 miles (0.80 km) of the beaches—evoke the quaint ambience of an early-20th century seasonal retreat. There are a great deal of hotels, cottage retreats, and businesses geared towards tourists.