- P. Geoffrey Feiss Papers, 2007/20101
- Pamela Webb Architectural Collection, 1950/20093
- Panoramic Photographs Collection, 1890/2008, bulk 1890/19602
- Papers of Mary V. Thompson, Research Historian, 1980/201252
- Papers of the Mount Vernon Ladies' Association, 1858/201671
- Pare Lorentz, Documentary Filmmaker, Clippings and Other Material Collected by James Guiher, Jr., 1977/20081
- Parents' Day and Parents' Weekend Records, 1966/20131
- Parking Services Records, 1970/2007, bulk 1970/20071
- Partners for Livable Communities records, 1960/2012, bulk 1970/201045
- Patricia Fishback papers, 1973/20097
- Patricia Russell Van Zandt papers, 1966/20092
- Patrick Hinely Collection, 1973/20151
- Patrick Oliphant artwork and papers, 1947/2016210
- Paul A. Miller Papers, 1946/20101
- Paul Atkins, Journalism Professor, Papers, 1860/20191