Ferry & Clas was an architectural firm in Wisconsin. It designed many buildings that are listed on the National Register of Historic Places. George Bowman Ferry and Alfred Charles Clas were partners.

Alfred Clas was an architect in Milwaukee, Wisconsin. He was a partner in the firm Ferry & Clas with George Bowman Ferry and in 1913 Alfred C. Clas partnered with his son Reuben F. Clas and with John S. Shepherd, as junior partners, to form the firm of Clas, Shepherd & Clas. Shepherd withdrew in 1931 and the firm became Clas & Clas, Inc., with Alfred Clas remaining president until his death in 1942.