Homan-Gerard House and Mills is a historic home and mill complex located at Yaphank in Suffolk County, New York. It is composed of a large Federal-style residence, four contributing related support buildings, and six contributing related archaeological sites. The house is a 2+1⁄2-story frame residence with a three-bay facade, gambrel roof, center chimney, and kitchen wing. Also on the property are three small sheds and a large 2-story, late-19th-century barn. Archaeological remains include that of the J. P. Mills Store and Homan-Gerard saw mill and grist mill.