- C.H. Street & Company Scrapbooks Collection (D-176)
- C.M. Silva & Son Correspondence. (D-417)
- California Agricultural Teaching Aid Photograph Collection. (D-528)
- California Association of the American Registry of Professional Entomologists. Records (D-448)
- California Canners and Growers Archives. (D-162)
- California League of Food Processors Archives. (D-093)
- California Lima Bean Growers Association. Collection. (MC045)
- California Native Plant Society. Collection. (D-376)
- California State Beekeepers Association Records. (D-075)
- California State Fair Photograph Collection. (MC209)
- California Wool Growers’ Association. Archives. (D-195)
- Camejo, Peter. Papers. (D-504)
- Campbell, Charles. Papers. (MC109)
- Campbell, Mrs. Patrick (1865-1940). Collection. (D-525)
- Campbell, Robert N. Papers. (D-502)
- Campbell, Robert N. Slides. (MC022)
- Carey, James R. Papers. (MC019)
- Carpenter, Donald R. (1931-1995 ). Correspondence (MC007)
- Carraco, Paul E. Papers. (MC106)
- Caterpillar 20. Collection. (D-308)
- Cazden, Joann Cohn. Collection. (D-228)
- Cebis, Frantisek R. Collection. (D-123)
- Chan, Rosemary. Papers and photographs (D-560)
- Charlet, Ray. Photograph Collection. (MC217)
- Chesley, Marie. Collection. (MC101)
- Chicano Record Collection. (D-419)
- Chiles, Austin C. Papers. (MC133)
- China-Hawaii Photograph Collection. (MC023)
- Chinese Fan and Embroidery Collection. (D-040)
- Chinese Nationalist Party Collection. (D-047)
- Chinn, Frank J., M.D. Collection. (MC184)
- Chis, Alex. Papers. (D-374)
- Christensen, William Peter. Papers. (D-331)
- Chumley, Dan. Papers (D-497)
- Cincinnati Butchers’ Supply Co. Collection. (D-367)
- Circle in the Square Photographs. (MC037)
- City of Davis Collection. (D-344)
- City of Davis/Maps. Collection. (MC148)
- Clauson, William. Cycling Collection (D-446)
- Clemmer, Richard O. Papers. (D-293)
- Cleveland, John F. Papers. (MC163)
- Clewe, John F. Correspondence (D-495)
- Cohn, Ruby. Correspondence (MC266)
- Coke, J. Earl. Collection. (MC190)
- Cole, Toby (1916-2008). Archives. (D-055)
- Collection of United States Bureau of Alcohol, Tobacco, and Firearms Records on California Wineries (D-140)
- College Park Association Collection (D-512)
- Colvin, Jean and Crowley, Daniel J. Carnival of Salvador de Bahia, Brazil Videocassettes. (D-518)
- Commission on Agricultural Education. Collection. (MC011)
- Commission on California Agriculture and Higher Education. (D-359)
- Committee of Small Magazine Editors/Publishers (COSMEP). Collection. (MC117)
- Companhia Geral da Agricultura das Vinhas do Alto Douro. Collection. (D-283)
- Condee, Robert A. Correspondence (MC260)
- Conn, Eric E. Papers. (D-440)
- Contemporary Issues Collection. (D-213)
- Cooke, George M. Papers. (D-028)
- Corman, Cid Letters to Frank Samperi. (MC013)
- Corman, Cid. Letters to Graham Ackroyd. (MC151)
- Corneretto, Alan. Wine Label Collection. (D-460)
- Corti Brothers, Inc. Collection. (D-323)
- Corti, Count Egon (1886-1953). Collection. (D-010)
- Cothran, Warren R. Papers (D-478)
- Cotton, Charles P. (1919-2007). Bicycling Collection (D-487)
- Counter Culture Poster Collection. (D-031)
- Cox, Rosalee. Collection. (MC159)
- Coyote, Peter (1941- ). Papers. (D-121)
- Craemer, Jeff. Collection. (MC118)
- Crafts, Alden S. (1897-1990). Papers. (D-153)
- Craig, Edward Gordon (1872-1966). Collection. (D-178)
- Craig, Thornton W. Papers. (D-088)
- Crampton, Beecher (1918-2003). Papers. (D-382)
- Crane, George Beldon. Diaries. (D-203)
- Crawford, Dan. Photographs (D-543)
- Crocheron, B. H. Papers. (MC170)
- Crowley, Daniel J. (1921-1998) Papers. (D-165)
- Cruess, William V. (1886-1968). Papers. (D-053)
- Cruikshank, George (1792-1879). Collection. (MC052)
- Cunningham Store Account Book. (D-412)
- Curley, Robert G. Collection. (D-511)
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