Newtonville Post Office is a historic post office building located at Newtonville in Albany County, New York, United States. It was built in 1852 as the First Baptist Church. It is a one story, rectangular red brick building with a gable roof. The Rev. William Arthur, father of President Chester Alan Arthur lived at Newtonville from 1855 to 1863 and according to tradition is believed to have preached in the church. Church use ceased in the late 19th century and the building was used as a school, bus garage, farm machinery sales office, and after 1940 as a post office.It was listed on the National Register of Historic Places in 1973.
