- Talbert, John. Papers. (MC149)
- Talbot, Steve. Papers. (D-362)
- Tanji, Kenneth K. Papers (D-476)
- Teiser, Ruth. Papers. (D-008)
- Thayer, Robert L. Papers on Landscape Architecture (D-626)
- Theatre Clippings Collection. (O-021)
- Theatre Design Collection. (O-023)
- Theatre Engravings Collection. (O-024)
- Theatre Ephemera Collection. (O-025)
- Theatre Posters Collection: International. (O-033)
- Theatre Posters Collection: United States. (O-032)
- Theatre Programs Collection: International. (O-018)
- Theatre Programs Collection: United States. (O-016)
- Theatre Promotional Materials Collection. (O-028)
- Theatre Scrapbooks Collection. (O-017)
- Theatre Serials Collection. (O-027)
- Thelen, Ray (1918-2005). Papers. (D-470)
- Thiel, Philip. Collection on Human Powered Recreational Watercraft (D-529)
- Thompson, Bob. Papers on Wine Writing (D-625)
- Thompson, Brian T. (1923-2011) Collection. (D-306)
- Thompson, Karla. Papers. (MC214)
- Thompson, Orville. Slides (MC001)
- Titus, Charles M. Papers (MC236)
- Tomes, Joseph. Papers. (D-066)
- Torrence, Jackie. Collection (MC145)
- Toulson, Hank. Collection. (MC204)
- Towler, John. Papers. (MC175)
- Trade Literature Collection (O-012)
- Trafton-Crane Family Photographs (D-592)
- Tree, Sir Herbert D. B. (1853-1917). Papers. (D-204)
- Tri/Valley Growers Collection. (D-150)
- Trudell, Clyde F. Collection. (D-024)
- True, Gordon Haines (1868-1928). Papers. (MC087)
- Tucker, Erasmus. Collection. (MC182)
- Tucker, John M. Papers (D-489)
- Tuma, Elias H. Papers. (D-258)
- Tupper, C. John (1920-1998). Papers. (D-264)
- Turner, John H. Collection. (MC171)
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