- T. Marshall Hahn, Jr., Papers, 1994/20161
- Tate Thompson Brady Family papers, 1785/20051
- Tax reports of public service corporations from the State Corporation Commission, 1895/20151
- Teach For America records, 2000/20082
- Temple Beth El scrapbooks, 1959/20095
- Terry L. Meyers papers, 1988/20106
- Thad W. Tate papers, 1949/20092
- Thaddeus Podratsky, Collector, Records Regarding the Socialist Party, 1911/2006, bulk 1911/19371
- The Edgar Cayce Readings, 1886-20201
- The Eric Shoaf Tom Wolfe collection2
- The Flat Hat records, 1911/20192
- The Forum Records, 1992/2005, bulk 1993/19952
- The Gentlemen of the College records, 1990/202311
- The Grove Renovation Records, 1900/20083
- The Photographic Archive of Fairfax County, Virginia - The General Collection, c.1720-200711