Ferry & Clas was an architectural firm in Wisconsin established in 1890 by George Bowman Ferry (1851–1918) and Alfred Clas (1859–1942). The firm designed many buildings that are listed on the National Register of Historic Places.

A Book of the Office Work of Geo. B. Ferry and Alfred C. Clas, Architects, Milwaukee, Wisconsin, was published in 1895. The partnership was dissolved in 1912.

Notable works First Unitarian Church (1891) at 1009 E. Ogden Avenue in Milwaukee (Ferry & Clas) NRHP-listed Knapp-Astor House (1891) at 930 E. Knapp Street and 1301 N. Astor Street in Milwaukee (Ferry & Clas) NRHP-listed Joseph Vilas Jr. House (1891–93) at 610–616 N. 8th Street in Manitowoc, Wisconsin (Ferry & Clas) NRHP-listed Pabst Mansion (1892) at 2000 W. Wisconsin Avenue in Milwaukee (Ferry & Class) NRHP-listed Tower of the Cathedral of St. John the Evangelist (1893) at 812 N. Jackson Street, Milwaukee (Ferry & Clas) NRHP-listed Franklyn C. Shattuck House (1893) at 547 E. Wisconsin Avenue at Neenah, Wisconsin (Ferry & Clas) NRHP-listed Central Library (1895) at 814 W. Wisconsin Avenue in Milwaukee (Ferry & Clas) NRHP-listed Saint James Court Apartments (1895, 1903) at 831 West Wisconsin Avenue in Milwaukee (Ferry & Clas) NRHP-listed State Historical Society of Wisconsin (1896–1900) at 816 State Street in Madison, Wisconsin (Ferry & Clas) NRHP-listed Mrs. Willis Danforth house (1897) at 819 N. Cass Street in Milwaukee, a 2.5-story house with half-timbering in the gable end (a Tudor Revival decoration). Contributing building in 1986-NRHP-listed Cass-Wells Street Historic District. With Wisconsin State Reformatory (1898) at the southeast corner of Riverside Drive and Route 172 in Allouez, Wisconsin (Ferry & Clas) NRHP-listed L. D. Fargo Public Library (1899–1902) at 120 E. Madison Street in Lake Mills, Wisconsin (Ferry & Clas) NRHP-listed Midsummer Carnival Shaft (1900) at W. Wisconsin Avenue between N. 8th and N. 11th Streets in Milwaukee Nye House (1901–12 remodel into Georgian Revival style) at 1643 N. Nye Avenue in Fremont, Nebraska (Ferry & Class) NRHP-listed. With Now houses the Louis E. May Museum and Dodge County Historical Society. Lake Park Pavilion (1903) in Milwaukee Jacob Van Orden House (1903) at 531 4th Avenue in Baraboo, Wisconsin (Ferry & Clas) NRHP-listed. Currently houses the museum of the Sauk County Historical Society. State Bank of Wisconsin (1903) at 210 E. Michigan Street in Milwaukee (Ferry & Clas) NRHP-listed Jackson District Library (1903, 1906) at 244 W. Michigan Street in Jackson, Michigan (Ferry & Clas) NRHP-listed Peter and Mattie Reiss House (1906) at 1227 N. 7th Street in Sheboygan, Wisconsin Sauk County Courthouse (1906) at 515 Oak Street in Baraboo, Wisconsin (Ferry & Clas) NRHP-listed Hiram Smith Hall and Annex (1909) at 1545 Observatory Drive at the University of Wisconsin-Madison (Ferry & Clas) NRHP-listed Charles Danforth house (1904) at 823 N. Cass Street in Milwaukee, a 2.5-story house in Dutch Colonial Revival style with dark brick walls. In the Cass-Wells Street Historic District. Lake Park Grand Staircase (1908) in Milwaukee Brittingham Park Boathouse (1909–1910) on N. Shore Drive in Madison, Wisconsin (Ferry & Clas, with John Nolen) NRHP-listed Tripp Memorial Library and Hall (1912–13) at 565 Water Street in Prairie du Sac, Wisconsin (Ferry & Clas) NRHP-listed

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