Collection
- Plant Railway system records, 1874-1922, Date acquired: 00/00/1984, bulk 1878-19001
- Pleas, Charles Earl, Papers, 1867-1954, Date acquired: 06/00/19701
- Porecki Orchid Collection, 1881-19921
- Port St. Joe Centennial Medal and Florida Centennial envelope and stamps, 1838-1945, Date acquired: 01/04/19391
- President William McKinley scrapbooks, 1843-19011
- Presidential signatures and ephemera collection of Parker and Joane Miller, 1790-19561
- Price, Elsie Goldsby, Papers, 1868-1933, Date acquired: 08/00/19811
- Proctor and Martha Jones Collection on Napoleon, Date acquired: 01/01/19991
- Public Relations, 1922-20101
- R.A. Gray Collection, 1863-1959, Date acquired: 01/01/19591
- Rabbi Abraham J. Rose Music Collection, 1887-1988, bulk 1921-19581
- Rabindranath Tagore Collection, ca. 1900-1965, bulk ca. 1910-19401
- Red Hills of Florida Collection, 1820-19941
- Reno Family Papers, 1900-20001
- Richard Alan Nelson collection, 1898-19801
- Rick and Patricia Ballantyne cigar label collection, 1880-1930, Date acquired: 12/01/20161
- Rita B. and James Lassiter Botany collection, 1895-1975, Date acquired: 01/28/20161
- Robert Kerstein collection, 1860-20001
- Robert Marius Reno (Rasmussen) Danish Postcard Collection, 1900-19251
- Roberts, Theodore R., Papers, 1878-1995, Date acquired: 01/00/19951