John S. Williams House and Farm, also known as Old Chatham Sheepherding Farm and Inn, is a historic home and farm designated a national historic district and located at Chatham in Columbia County, New York. The district includes seven contributing buildings. They are: the main house, a farm employee cottage, another cottage, a stone tool shed (originally a smoke house), and three small barns / garages. The main house is a two-story, frame building with a center hall plan. The house dates to the about 1770, but was extensively enlarged and remodelled in 1935–1936 in the Colonial Revival style, under direction by New York City architects Polhemus & Coffin. It was listed on the National Register of Historic Places in 1996.