| Title | Assigned Subject |
|---|
| Sacramento Book Collectors Club Collection. | Language and Literature |
| Sacramento Muncipal Utility District. Collection. | Natural Resources |
| Sacramento Union Newspaper. Archives. | California History |
| Sakaki, Nanao. Collection. | Language and Literature |
| San Buenaventura, Steffi (1941-2002). Papers. | Ethnic Studies |
| San Francisco Ballad Slips and Song Sheets Collection. | Language and Literature |
| San Francisco Mime Troupe Archives. | Performing Arts |
| San Francisco Oracle Archives. | Language and Literature |
| Sanfield, Steven H.(1937- ). Papers. | Language and Literature |
| Saratoga Horticultural Research Foundation Records | Plant Science |
| Sarlos, Robert K. (1931-2008). Papers. | Performing Arts |
| Sarna-Wojcicki, Matthew. Cycling Periodicals Collection. | |
| Satterlee, Charles E. Papers. | Art and Architecture |
| Save the Redwoods League. Archives. | Natural Resources |
| Scenes of England and Wales Collection. | Art and Architecture |
| Schacht, Henry M. (1916- ). Papers. | Agriculture |
| Schack, Paul. Collection. | Viticulture and Enology |
| Schaefer, Norman. Papers. | Language and Literature |
| Schafer, Jack. Collection. | Agricultural Technology |
| Scheuring, Ann F. (1937- ). Papers. | Agriculture |
| Schmeiser Collection. | California History |
| Schmidt, Leon H. Collection. | Animal Science |
| Schneeman, Barbara O. Papers | Food Processing and Manufacture |
| Schneeman, Charles E., Jr. Papers. | Art and Architecture |
| Schoenstedt, Walter (1909-). Papers. | Language and Literature |
| Schutt, Ellen Isham. Pomological Watercolors. | Art and Architecture |
| Schwab, Richard. Papers. | Language and Literature |
| Scott, Sidelle. Artists books | Art and Architecture |
| Searls Family Papers | California History |
| Shaffer, Jack. Collection of Cooperatives Materials. | |
| Shank, David. Papers. | Agriculture |
| Shapiro, Daniel (1920-1982). Papers | Art and Architecture |
| Sheet Music. Collection. | Performing Arts |
| Sherwood, Morgan B. Papers. | Political Science |
| Shideler, James H. (1914-1998). Collection. | Agriculture |
| Shields, Peter J. (1862-1962). Collection. | California History |
| Shragge, Elaine. Papers. | Performing Arts |
| Silverman, Joseph H. (1924-1989). Collection. | Language and Literature |
| Simmons, Marie. Collection. | California History |
| Singleton, Vernon L. Papers. | Viticulture and Enology |
| Sipapu Archives. | Language and Literature |
| Sixteenth Century Bible Leaves Collection. | Language and Literature |
| Slagle, Al Logan. (1950-2002). Collection. | Ethnic Studies |
| Slater, Colby E. "Babe" Collection | California History |
| Smith, Alfred F. (1919-2008). Papers | California History |
| Smith, Leslie M. (1903-1976). Papers. | Entomology |
| Smith, Michael P. Papers | Political Science |
| Smith, Milo B. Papers. | California History |
| Smith, Waddell F. Papers. | California History |
| Smith, William Henry Sedley. (1806-1872). Sides. | Performing Arts |
| Smith, Wilson (1922- ). Papers. | Political Science |
| Snyder, Gary S. (1930- ). Papers. | Language and Literature |
| Snyder, Gary. Letters to Cid Corman. | Language and Literature |
| Snyder, James. Collection. | Ethnic Studies |
| Society of Automotive Engineers Collection. | Agricultural Technology |
| Soltero, Emilio. Papers. | Art and Architecture |
| Special Libraries Association. Sierra Nevada Chapter. Records. | California History |
| Spencer, Howard O. Correspondence | |
| Spicer, James and Morris Ploscowe. Collection. | Performing Arts |
| Spieker, Warren E., Jr. Collection of Oral Histories of Waterfowl Hunters | Animal Science |
| Spreckels Sugar Company Collection. | Food Processing and Manufacture |
| Squaring the Circle Collection. | Performing Arts |
| Squat Theatre Archives. | Performing Arts |
| Stafford, Eugene M. (1910-1980). Correspondence. | Entomology |
| Stebbins, George Ledyard (1906-2000). Papers. | Plant Science |
| Steiner, Howard. (1897- ). Collection. | Agricultural Technology |
| Steinmetz, Andrew (1816-1877). Papers. | Language and Literature |
| Stevens, James. Collection. | Political Science |
| Stewart, M.A. Papers. | Entomology |
| Stilson, Charles L. Papers | California History |
| Stirniman, E. J. Papers. | Agricultural Technology |
| Stones, Margaret. Watercolors. | Art and Architecture |
| Storer, Tracy I. (1889-1973) Papers. | Animal Science |
| Stout, Perry R. (1909-1975). Papers. | Plant Science |
| Stowell, Robert E. (Robert Eugene), 1914-2011. Papers. | |
| Stumpf, Paul K. Slides of the University of California, Davis and Davis, California. | California History |
| Styles, Florence H. Papers. | California History |
| Sullivan, Charles L. Collection. | Viticulture and Enology |
| Summers, Francis Marion (1906-1994). Correspondence. | Entomology |
| Sunshine Farm Dairy. Archives. | Agriculture |
| Sutherland, Howard Vigne. Papers. | Performing Arts |
| Sutter Basin Company Archives | California History |
| Sutter Buttes Oral History Collection | California History |
| Sutter, John Augustus (1803-1880). Papers. | California History |
| Swift, Dorothy. Papers. | Language and Literature |
| Swift, Richard (1927-2003). Papers. | Performing Arts |
