US Post Office-Penn Yan is a historic post office building located at Penn Yan in Yates County, New York.

It was designed and built in 1912–1913 and is one of a number of post offices in New York State designed by the Office of the Supervising Architect of the Treasury Department, James Knox Taylor.

It is a symmetrically massed, 1+1⁄2-story red brick structure on a granite-clad raised basement in the Colonial Revival style.

It is a contributing element in the Penn Yan Historic District.

This article about a historic property or district in Yates County, New York, that is listed on the National Register of Historic Places, is a stub.