Marina Bay is a mixed-use development neighborhood of condominium, commercial and entertainment facilities in Quincy, Massachusetts. It includes five housing complexes (including detached, townhouse and low-rise apartment units) and one assisted living complex, office complexes, numerous restaurants, 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.
Marina Bay is not a city by itself, and unlike all other neighborhoods of Quincy it is not yet listed in the United States Geological Survey database of named places in the United States. However, in 2004 it gained temporary notoriety as such when New England Patriots linebacker Willie McGinest was interviewed at home on a nationally televised NFL playoffs broadcast and the location for the live pictures was given at the bottom of the screen as "Marina Bay, Massachusetts". This designation is not officially recognized by the United States Postal Service, which only accepts presorted mail destined for the 02171 ZIP code that is addressed to either Quincy, North Quincy or Squantum, MA. Nevertheless, Marina Bay residents and the local media took note of the broadcast and a story in the Boston Globe outlining the success of the complex and its popularity among athletes and local celebrities appeared shortly after the McGinest interview.