Fenwick Island is a coastal resort town in Sussex County, Delaware, United States. According to 2020 census figures, the population of the town is 355, a 2.6% decrease over the last decade. It is part of the Salisbury, Maryland–Delaware Metropolitan Statistical Area. The town is located on Fenwick Island, a barrier spit.

Fenwick Island State Park is a 344-acre (139 ha) Delaware state park between Ocean City, Maryland and South Bethany, Delaware in Sussex County, Delaware, US. Fenwick Island State Park is open for year-round recreation from 8:00 am until sunset. Originally part of Delaware Seashore State Park, it was established in 1966 and renamed in 1981. The park is located on Fenwick Island, a narrow strip of land between the Atlantic Ocean and Little Assawoman Bay. It is largely undeveloped in comparison to the beach communities that surround it.