1. See also

Sergius I may refer to:

• Sergius of Tella, Patriarch of the Syriac Orthodox Church in 544–546
• Sergius I of Constantinople (died in 638)
• Pope Sergius I (died in 701), Sicilian-born pope
• Sergius I of Naples (died in 864)
• Patriarch Sergius I of Moscow (1867–1944)

See also

• Sergius

• William Talltrees
• William Tanat Foulkes
• William Tancred
• William T. and Clara H. Veazie House
• William Tankerd
• William Tannen (actor)
• William Tanner (cricketer)
• William Tanuwijaya
• William Taramai
• William Tash
• William Tasker (poet)
• William Tasman
• William Tassie (teacher)
• William Tate (bowls)
• William Tatton
• William Taverner (fl. 1397-1407)
• William Tayloe (planter)
• William Tayloe (the immigrant)
• William Tayloe (the nephew)
• William Taylor (academic)
• William Taylor (author)
• William Taylor Birchenough
• William Taylor Birchenough (Aviator)
• William Taylor (boxer)
• William Taylor Bryans