US Post Office-Rye is a historic post office building located at Rye in Westchester County, New York, United States. It was built in 1935 and designed by the Office of the Supervising Architect under the direction of Louis A. Simon. It is a one story symmetrical flat roofed building in the Colonial Revival style. The front facade features a central, recessed entrance with broad limestone surround and shallow decorated cornice. The lobby features a mural by Guy Pene du Bois painted in 1938 and titled "John Jay at His Home."It was listed on the National Register of Historic Places in 1989.The building was renamed the Caroline O'Day Post Office on October 23, 2010 in recognition of Congresswoman Caroline O'Day's public service.
