Eastport is a hamlet and census-designated place (CDP) in Suffolk County, New York, on the South Shore of Long Island.

The present hamlet dates to 1772, when two men built the dam that formed what has come to be called the West Pond, which created a dividing line between Brookaven and Southampton.

When, in 1860, the United States Postal Department needed to define the town to deliver mail, it combined the two areas.

[7] Practically all duck farms have been phased out and the descendants of the original farmers sold the valuable waterfront property for residential development projects.

According to the 2021 American Community Survey,[10] the population decreased slightly from the 2020 census, down to 2,095 people.

Eastport is located within the Eastport-South Manor Central School District.