Shinnecock Reservation is a Native American reservation for members of the Shinnecock Indian Nation in the town of Southampton in Suffolk County, New York, United States. It is the furthermost east of the two Native American reservations in Suffolk County; the other being Poospatuck Reservation in the town of Brookhaven. It lies on the east side of Shinnecock Bay on southeastern Long Island, near Tuckahoe, Shinnecock Hills, and the village of Southampton. The population was 819 as of the 2020 census. Roughly that many tribal members additionally live off the reservation.

The Shinnecock Indian Nation is a federally recognized tribe of historically Algonquian-speaking Native Americans based at the eastern end of Long Island, New York. This tribe is headquartered in Suffolk County, on the southeastern shore. Since the mid-19th century, the tribe's landbase is the Shinnecock Reservation within the geographic boundaries of the Town of Southampton. Their name roughly translates into English as "people of the stony shore".