- Pace Family Papers, 1947/20062
- Pamela Webb Architectural Collection,, 1950/200912
- Panoramic Photographs Collection, 1890/2008, bulk 1890/19601
- Papers of Mary V. Thompson, Research Historian, 1980/201298
- Papers of the Mount Vernon Ladies' Association, 1858/201693
- Pare Lorentz, Documentary Filmmaker, Clippings and Other Material Collected by James Guiher, Jr., 1977/20081
- Parents' Day and Parents' Weekend Records, 1966/20132
- Parking Services Records, 1970/2007, bulk 1970/20072
- Partners for Livable Communities records, 1960/2012, bulk 1970/201038
- Partners for Livable Communities records, 1970/201038
- Patricia Fishback papers, 1973/200910
- Patricia Russell Van Zandt papers, 1966/20092
- Patrick Hinely Collection, 1973/20151
- Patrick Kane papers, 1967/20022
- Patrick Oliphant artwork and papers, 1947/201695