- W.B. Clarke & Co. Nursery Records (D-595)
- Waggoner (W.W.) Papers (MC255)
- Wagner, D. R. Papers. (D-386)
- Wagnon, Kenneth A. (1907- ). Collection. (MC078)
- Wagstaff, Christopher. Collection. (MC025)
- Walker, Harry B. (1884-1957). Papers. (D-111)
- Walker, Harry O. Slide Collection. (D-398)
- Walker, Spinning, and Durrell Families Papers (D-226)
- Walrus & Carpenter Club Collection. (MC207)
- Walters, Richard Francis. Papers. (D-370)
- Walters, Shipley. Papers. (MC046)
- Warde, Frederick B. (1851-1935). Collection. (MC091)
- Watkins, Lee H. (1908-1972). Collection. (D-084)
- Webb, A. Dinsmoor (1917-2003). Papers. (D-388)
- Webb, Nancy. Papers. (D-020)
- Weber, Brom (1917-1998). Papers. (D-027)
- Webster, Grady L. (1927-2005). Papers. (D-299)
- Weeks, David. Papers (D-583)
- Weeth, Lois Weston. Collection on UC Davis History (D-598)
- Weier, T. Elliot (1903-1991). Papers. (D-019)
- Weslow, Jessie C. Papers. (MC062)
- West, Martha. Papers. (D-508)
- Western Independent Publishers Collection. (D-224)
- Western Machinery Company Archives. (D-218)
- Westgate, Warren A. (1904-1989). Collection. (D-167)
- Whalen, Philip. Correspondence. (D-492)
- Whitaker, Thomas W. Papers (D-578)
- White, Ellis. Collection. (D-183)
- Wickson, Edward J. (1848-1923). Papers. (D-037)
- Wiggins, Robert A. (1921-1989). Papers. (D-301)
- Wilcoxson, Jefferson. Papers. (D-416)
- Wiley, William T. (1937- ). Collection. (MC002)
- Wilhelm, Stephen. Collection. (D-311)
- Williams, Hibbard E. Papers on Endocrinology (D-622)
- Williams, Milo B. (1882-1954). Papers. (D-130)
- Williams, Tennessee (1911-1983). Papers. (MC074)
- Williamson, Alan Bacher. Papers. (D-522)
- Williamson, Joseph F. Papers. (D-443)
- Willis, Peter. Collection. (MC004)
- Wilson, Virginia P. Papers. (MC088)
- Wilson, Virginia Perry Collection on Jesse Stuart (MC047)
- Wine Industry Technical Seminars Archives. (D-281)
- Wine Institute. Collection. (D-242)
- Wine Receipts. Collection. (MC134)
- Wines and Vines Collection. (D-071)
- Winter, Samuel and Mary. Collection. (D-383)
- Witkin, Bernard E. Collection. (D-339)
- Wolfskill Family Collection (D-023)
- Woll, T.W. Papers. (MC188)
- Wood, Douglas. Papers. (MC174)
- Wood, Jim. Collection. (MC183)
- Wood, William B. (1779-1861). Collection. (MC092)
- Woodcuts Collection. (MC055)
- Wooden, Wesley. Papers. (D-225)
- Woodland Opera House Collection. (D-190)
- Wordsworth, Dorothy (1771-1855). Collection. (MC100)
- World War I and II Ephemera Collection. (D-068)
- Wright, Celeste T. (1906-1999). Papers. (D-161)
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