The Historic Main Post Office in Niagara Falls. The post office is located at 615 Main Street. It was designed and built 1904-1907, designed by the Office of the Supervising Architect of the Treasury Department, James Knox Taylor. The two story building is constructed of white Vermont marble on a granite base in a French Neoclassical style with Beaux-Arts details.

It was listed on the National Register of Historic Places in 1989.