- Arthur B. Spingarn Papers, ca. 1900-19711
- Bake/Jairazbhoy Digital Archive of South Asian Traditional Music and Arts1,127
- Bennett (Walter E.) Photographic Collection, 1937-1983 (bulk 1952-1982)78
- Bound Manuscripts Collection4
- Broadside Ballads from England, Ireland, and the United States.5
- Brown (Bob) Papers17
- Bunche (Ralph J.) Papers39
- C.C. Pierce Photographic Collection, circa 1898-1934428
- Carey McWilliams Papers, 1894-1982 (bulk 1921-1980)5
- Carleton Watkins Collection of Photographs, ca. 1867-188236
- Carteles de Cine1,341
- Cashin (Bonnie) Collection of Fashion, Theater and Film Costume Design, 1913-20006,997
- Castillo (Oscar R.) Photograph Collection1,812
- Centro Cultural Tallersol (Chile)150
- Charles Kikuchi Papers, 1941-19884
- Cole Family Papers, 1833-19432
- Colin Higgins Papers, ca. 1960-19871
- Collection of California Fruit Labels, ca. 1905-19494
- Collection of California Postcards13
- Collection of Zionist Posters Promoting Israel to Diaspora Jews, 1940-197939