- Tate Thompson Brady Family papers, 1785/20053
- Tax reports of public service corporations from the State Corporation Commission, 1895/20151
- Taylor & Hyre (Heyer) Families Genealogies, 19881
- Temple Beth El scrapbooks, 1959/20097
- Tercentenary Records, 1987/19934
- Terrill-Porterfield Families, Papers regarding the Civil War and Other Material, 1716/1994, bulk 1840/19201
- Terry Burton, Collector, Ogden House Collection, 1886/19971
- 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 Center for Nursing Historical Inquiry collection, 1934/200114
- The Dunn Loring, Virginia Survey Slide Collection, 1988299
- The Edgar Cayce Readings, 1886-20201
- The Eric Shoaf Tom Wolfe collection2
- The Fairfax County Office of Comprehensive Planning Heritage Resources Branch Slide Collection, 1967-199357