St. Thomas' Episcopal Church is located on Leedsville Road (Dutchess County Route 2) in Amenia Union, New York, United States. It is a mid-19th century brick church designed by Richard Upjohn in the Gothic Revival architectural style, built for a congregation organized shortly before. It is considered one of the finest American imitations of an English country parish church. Inside, it has a historic organ and Tiffany stained glass windows. In 2005 it, along with its parish house and a carriage step, were added to the National Register of Historic Places