Marina Bay is a mixed-use development neighborhood of condominium, commercial and entertainment facilities in Quincy, Massachusetts. It includes five housing complexes and one assisted living complex, office complexes, numerous restaurants, a craft brewery and taproom, a 685-slip marina and a seaside boardwalk. It is situated on the northwestern part of Squantum Peninsula at the mouth of the Neponset River where it meets Dorchester Bay in Boston Harbor. The permanent residential population of Marina Bay in 2000 was about 1,300 according to the United States Census Bureau,; however, the Boston Globe reported in 2004 that the complex had 2,000 residents.

Naval Air Station Squantum was an active naval aviation facility during 1917 and from 1923 until 1953. The original civilian airfield that preceded it, the Harvard Aviation Field, dates back to 1910. The base was sited on Squantum Point in the city of Quincy, Massachusetts. It also abutted Dorchester Bay, Quincy Bay, and the Neponset River.