Ainsworth House may refer to:
Lewis Ainsworth House, Orange, California, listed on the National Register of Historic Places (NRHP) in Orange County William W. and Elizabeth J. Ainsworth House, Des Moines, Iowa, NRHP-listed Ainsworth House (Thompson Falls, Montana), NRHP-listed in Sanders County Capt. John C. Ainsworth House, Oregon City, Oregon, NRHP-listed in Clackamas County Maud and Belle Ainsworth House, Portland, Oregon, NRHP-listed Oliver N. Ainsworth House, Spearfish, South Dakota, NRHP-listed in Lawrence County Ainsworth House (Big Trails, Wyoming), NRHP-listed in Washakie County
See also Boatman-Ainsworth House, Lakewood, Washington, a NRHP-listed in Pierce County