Upper New York Bay, also known as New York Harbor, is an estuary and bay of the North Atlantic Ocean located at the mouth of the Hudson River between New York City and New Jersey. The bay is further connected to Lower New York Bay through both the Narrows (a strait separating the New York City boroughs of Brooklyn and Staten Island) and the Kill Van Kull-Newark Bay-Arthur Kill seaway (another series of strait separating Staten Island and mainland New Jersey), and to Long Island Sound through the East River. Both Lower New York Bay and Long Island Sound connect to the greater Atlantic.

In the 1987 TV series episode Tower of Power, the Turtles and Splinter begin their trip to Europe by riding in the Maude from the harbor. They first believe they will ride in luxurious liner-ship Paradiso. Many episodes also have Shredder hiding out at abandoned places in the docks.

The Statue of Liberty is located on Liberty Island in Upper New York Bay, and has been visited in different versions of Teenage Mutant Ninja Turtles.

In the Mirage continuity, Upper New York Bay was chosen by the Utroms to land their massive spacecraft which would become anchored as an artificial island in the harbor.

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