Hans Herr House, also known as the Christian Herr House, is a historic home located in West Lampeter Township, Lancaster County, Pennsylvania. It was built in 1719, and is a 1 1/2-story, rectangular sandstone Germanic dwelling. It measures 37 feet, 9 inches, by 30 feet, 10 inches. It is the oldest dwelling in Lancaster County and the oldest Mennonite meetinghouse in America. The Mennonites who worshipped there formed the nucleus of what became the Willow Street Mennonite Congregation. It was restored to its 1719 appearance in 1972-73.