The Metuchen Post Office is a historic United States Post Office located at 360 Main Street in the Borough of Metuchen in Middlesex County, New Jersey.

Listed as United States Post Office, it was added to the National Register of Historic Places on April 2, 2008, for its significance in architecture, art, communications, and politics/government.

[3] Louis A. Simon, the Supervising Architect in the Office of the Supervising Architect for the U.S. Treasury, designed the building using Colonial Revival style.

Construction began in 1939, with Neal A. Melick as Supervising Engineer.

The presence of a cupola helped indicate that this was a public building.