- L. C. Angle, Jr., Collection, 1860/20012
- L. Claire Kincannon theatre collection, 1941/201511
- L. Jane Hastings Architectural Papers, 1951/19989
- LGBTQ Student Center records, 1993/20172
- La Organización de Hispanos Unidos records, 1994/19991
- Lacrosse Records,, 1973/20102
- Land Records of the MVLA, 1858/20061
- Larry Levis papers, 1974/200697
- 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, 1966/20074
- Laurel Archer Copp Papers, 1953/20101
- Laurin L. Henry papers, 1930/20221