- L. C. Angle, Jr., Collection, 1860/20012
- L. Claire Kincannon theatre collection, 1941/201510
- L. Jane Hastings Architectural Papers, 1951/199810
- LGBTQ Student Center records, 1993/20172
- Lacrosse Records,, 1973/20102
- Land Records of the MVLA, 1858/20062
- Larkspur Press Collection, 1974/19941
- Larry Jones, Collector, Postcards, Photographs, and Other Material, 1785/1993, bulk 1897/19931
- Larry Levis papers, 1974/200679
- Larry McBryde Collection on the John McLaren McBryde Family, 1859/20133
- Larry Schecker playbills and pamphlets collection2
- Larry Schecker playbills and pamphlets collection, 19992
- Larry Schwab, Ophthalmology Professor, Books and Other Material, 1987/20071
- Larry Shaver, Collector, Isaac Asimov Collectibles, 1966/20072
- Laurel Archer Copp Papers, 1953/20101