Great Bay may refer to a water body in the United States:
*
Great Bay (New Hampshire)
Great Bay is a tidal estuary located in Strafford and Rockingham counties in eastern New Hampshire, United States. The bay occupies over , not including its several tidal river tributaries. Its outlet is at Hilton Point in Dover, New Hampshire, ...
, a tidal estuary in southeastern New Hampshire
*
Great Bay (New Jersey)
Great Bay is located in southern New Jersey's Atlantic Coastal Plain in Ocean and Atlantic Counties, about north of Atlantic City and south of New York City. The Mullica River flows into the bay, and together they form the Mullica River - Gr ...
, a tidal estuary north of Atlantic City
It may refer, also to:
*
Great Bay, Tasmania. a locality in Australia
*
Great Bay, a videogame location from The Legend of Zelda: Majora's Mask
{{disambig