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Bay Shore is a hamlet in the Town of Islip, Suffolk County. It is situated on the South Shore of Long Island, adjoining the Great South Bay. The northern boundary of Bay Shore is the Southern State Parkway. The northern part (just south of the parkway) includes the hamlet of North Bay Shore. North of the parkway is North Bay Shore, which contains the hamlet of Pine Aire and part of the hamlet of Brentwood.

The Village of Brightwaters is west of Bay Shore. The Great South Bay is to the south.