- Tarpey
- Devoted to the Tarpey family, based in Lexington, KY. - Tarry / Maskell
- Tracing the Tarry and Maskell lines from the mid-eighteenth century. - Tavendale
- Genealogy of David Tavendale from Aberdeenshire, Scotland. - Teague
- Also Tyack(e), Teage, Tigue, Tague, and Teg(g). - Tegart
 - Tenney
- Dedicated to those who came before, leaving a heritage and a name to be proud of. - Terwilliger
- Generations of families from Holland to the West Coast of the U.S. - Teskey
- For the genealogy of the Teskey family of Irish Palatine descent. - Tevault
- Also Warren, Starks, Simpson, Slabaugh, and Hayden. - Theriault
- History of the Acadian family in North America, with particular details of the Joseph T. Theriault family of the St. John River Valley. Thomas Williams of Gnossall
- Ancestors and descendants through 10 generations.- Thorn / Thorne
- Also Coutant. - Throckmorton
 - Tir na nO'Gara
- Dedicated to Genealogy and History of the Irish Clan O'Gara. - Titchenal
- From Martin Titchenor's arrival in 1644 through the westward expansion to the global village of today, 13 generation of Titchenals have participated in United States history. - Titterton
- Anyone interested in the surname's history should find this site of interest. - Toney
- For researchers of the "Toney" surname to exchange GEDCOM files, links and any other information that might be useful to others in tracing the Toney family tree. - Tonge (1)
- Tonsing / Bernard
- Also researching Toensing, Walker, Martin, Challiss, Pittenger, Patterson, Farmer, Thompson, Ford, Damron, and other surnames. - Tooker
- Genealogy collective for the Tooker/Tucker clan. - Toothaker (1)
- Toscani
- Devoted to all the people who carry the surname. - Touzel
- Examines the family roots, history, and people. - Townsend
- Dedicated to the preservation and research of American history, particularly as it pertains to the Townsend family. - Treadway
 - Treadwell / Tredwell
 - Tremble / Sawyer
- Includes: Trimble, Trembly, Radley, Richardson, Laws, Jones, Dunham, and Noe. - Trethowan
 - Trulsas
- Family which originates from the Sweden. - Tullio / Gardom
- Offering family histories and requesting any additional information. Turford
- Dedicated to the tracking and linking with Turfords around the world.- Turner (3)
- Turteltaub
- History of the Turteltaub, Turkeltaub, Tarkeltaub, Turell, and Turtledove surnames. - Tuttle
- Dedicated to the descendants of J.M. Tuttle and Alice Idella (Purinton) Tuttle. - Tyler
- Researching the descendants of John Tyler in New England from the 18th Century to the present. - Tyree
- Contains family trees for several Tyree families. - Tyzack
- Tyzack and Henzell family genealogy. Includes English Civil Registration databases.
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