Horseneck Beach State Reservation is a public recreation area comprising more than 800 acres (320 ha) on the Atlantic Ocean in the southern portion of the town of Westport, Massachusetts.

The reservation occupies a peninsula that juts out from Westport's mainland with Rhode Island Sound to the southwest and Buzzards Bay to the southeast.

The reservation features 2 miles (3.2 km) of barrier beach, marshland, and a protected estuary habitat.

The beach is located along the southern portion of the peninsula, bordering Rhode Island Sound and Buzzards Bay.

Restroom facilities, management office, food bar, designated on-duty lifeguard towers, and paved walkways are found alongside the beach.