- Carneal and Johnston Architectural Drawings, 1939/19681
- Carol M. Newman Papers, 1897/19581
- Carol M. Newman, Jr., Papers, 1930/19871
- Carrie T. Sibold Family Papers, 1912/1990, bulk 1974/19901
- Charles Burchard Collection, 1935/19891
- Christopher C. Kraft Papers, 1941/1998, bulk 1941/19821
- Clarence Paul Miles Papers, 1902/19601
- Claudius Lee Papers, 1887/19541
- Clinton H. Cowgill Collection, 1916/19771
- College of Agriculture and Life Sciences (CALS) Collection, 1900/20011
- Conan W. Vaughan, Jr., Papers, 1923/19921
- Dayton M. Kohler Papers, 1889/19711
- Diploma Collection, 1877/19641
- Dr. Richard Zallen Papers, 1940/20071
- E. B. Norris Papers, 1928/19551