Collection
- Mary Theresa Kraus Collection, 1942-1998, Date acquired: 11/05/2008, bulk 1942-19451
- May Ryburn Papers, 1880-2003, bulk 1925-20031
- McCrellen, Jean, Papers, 1968-1987, Date acquired: 03/00/19881
- McDaniel-Pappas Floridiana collection, bulk mid-1970s through mid-1980s1
- Melvin R. Bielawski Collection, 1930-2008, Date acquired: 05/12/19981
- Melvin Rackleff collection, 1912-2005, Date acquired: 11/12/1999, bulk 1944-19461
- Men's Camellia Club of Pensacola Records, 1937-1989, Date acquired: 04/00/19891
- Metzger, Lewis William, Papers, 1921-1985, Date acquired: 08/00/19891
- Michael A. Spencer Collection on Henry Nehrling, 1894-19971
- Michael Hirsh manuscript collection, 1970-2010, Date acquired: 00/00/20101
- Mike Resnick collection, 1980-2000, Date acquired: 06/00/19951
- Minutes of the southeastern annual meeting of the Religious Society of Friends, 1950-1992, Date acquired: 00/00/19921
- Miscellaneous posters and illustrations, 1934-20071
- Modesto A. Maidique Personal Files & Ephemera, 1979-20091
- Mona Greenberg Magazine Collection, 1968-2004, Date acquired: 03/00/20171
- Monte Allen U.S.S. Kwajalein collection, 1944-2009, Date acquired: 2016-08-03, Date accessioned: 2020-05-13, bulk 19451
- Moody family papers, 1886-1997, Date acquired: 12/00/19971
- Morton Gold Collection, 1924-2012, Date acquired: 00/00/2009, bulk 1970-20121
- Mu Mu (Phi Theta Kappa Honors Society), 1962-20031
- Museum of Contemporary Art Jacksonville Collection, 1977-20101