- C. P. Pesek Collection (29)
- CBI Fragile Publications (9)
- CBI Oral History Collections (101)
- CBI Reference Files (1)
- Campus Maps and Blueprints (561)
- Carlton Avenue YMCA records (9)
- Carpatho-Rusin American Collection (4)
- Carver Land Grant Papers (26)
- Cathedral of St. Paul, Construction Letters, 1907-1915 (1429)
- Catherine Azora-Minda Audio Tapes (46)
- Central Files Records (110)
- Cereal Rust Laboratory Records (449)
- Channing Tobias Papers (68)
- Charles K. Ober Papers (1)
- Chicano Studies Records (43)
- Child Study Association of America Records (64)
- Child Welfare League of America Records (9)
- Chris Cinque Papers (6)
- Christopher Webber Hall Papers (22)
- City Maps (338)
