Oliver Warner Farmstead is a historic farm complex and national historic district located in the towns of Hopewell and Phelps near Clifton Springs in Ontario County, New York. The 203 acre district contains three contributing buildings. The buildings are a cobblestone farmhouse built about 1840 in the late Federal / early Greek Revival style, a 19th-century barn, and 19th century wagon house / machine shed. It was listed on the National Register of Historic Places in 1988.