St. Mary's of the Mountain Church is a historic Roman Catholic church on New York State Route 23A in Hunter, Greene County, New York. The church was completed in 1839 and is a one story, four by two bay, post and beam frame structure on a modern concrete foundation. It features a moderately pitched gable roof, narrow clapboard sheathing, two engaged corner towers, and a Romanesque style engaged entry / bell tower. Also on the property is the parish cemetery. It was razed on 04/12/17.It was added to the National Register of Historic Places in 1999.