The Castleton Medical College Building, now known as the Old Chapel, is a historic building of the Castleton Medical College on Seminary Street in Castleton, Vermont, United States. Founded in 1818, it was the first medical college in Vermont, and the first private degree-granting medical school in the United States. The chapel-like building was built in 1821, and is now the oldest building on the campus of Castleton University. Its current use is for special meetings and performances for Castleton University. It was listed on the National Register of Historic Places in 1971.