John Thompson Williams Jennings (May 5, 1856 – July 9, 1944) was an American architect from Brooklyn.^[1] He was the Milwaukee Railroad's architect from 1885–93 and was part-time supervising architect for the University of Wisconsin from 1899 to 1906. He contributed to many prominent campus buildings.

List of buildings designed or overseen

• Milwaukee Road depot (1889), Darlington, Wisconsin^[2]
• Milwaukee Road Railway depot [1] (1890), Whitewater, Wisconsin
• University of Wisconsin–Madison King Hall, 1525 Observatory Drive, built in two stages as an expandable design (1894 and 1896)^[3]
• University of Wisconsin–Madison Dairy Barn[2] (1897), 1915 Linden Dr. Madison, Wisconsin
• University of Wisconsin–Madison Agricultural Bulletin Building (1899) [3]
• Janesville Public Library [4] [5] (1902), S. Main Street, Janesville, Wisconsin
• University of Wisconsin–Madison Agriculture Hall [6] (1903)
• University of Wisconsin–Madison Engineering Building (Old Education) [7]
• Dunn County Training and Agricultural School (with Claude and Starck) Menomonie, Wisconsin
• Delafield Fish Hatchery, Main St., Delafield, Wisconsin