Walrath-Van Horne House is a historic home located at Nelliston in Montgomery County, New York. It was built in 1842 and was originally a -story Greek Revival stone house with a full-height portico. In 1895, a frame, shingled second story topped by a Mansard roof and new porch with mansard styling replaced the original. The house retains some Greek Revival interior styling, but the exterior has a Second Empire style.
It was added to the National Register of Historic Places in 1980.