US Post Office-Bath is a historic post office building located at Bath in Steuben County, New York. It was built in 1931 and is one of a number of post offices in New York State designed by the Office of the Supervising Architect under James A. Wetmore. It is a two-story symmetrically massed brick structure with a one-story rear wing in the Colonial Revival style. The front facade features a limestone pedimented portico supported by four Corinthian columns. It is located within the Liberty Street Historic District.

It was listed on the National Register of Historic Places in 1988.