- Clara Barton Diaries (5)
- Clarence E. Lund Papers (17)
- Classical Urdu Poetry (22)
- Cloquet Forestry Center Records (706)
- Close Associates Papers (105)
- Clyde H. Bailey Papers (25)
- College of Agriculture Records (182)
- College of Liberal Arts Records (36)
- Colored Work Department Records (124)
- Conference on Data Systems Languages Records (16)
- Congdon Family Papers (UMD) (119)
- Constance Fisher Papers (4)
- Control Data Corporation Records (1718)
- Convento y Hospital de Refugio Records (1)
- Corn Tassel Southern School of Agriculture Yearbooks (21)
- Council on Social Work Education Records (136)
- Countee Cullen Correspondence Collection (75)
- Croatian American Collection (33)
- Crookston Campus Art and Artifacts (UMC) (20)
- Cuneiform Collection (19)
