title: Thomas I
text: # Thomas I
  
  Thomas I may refer to:
  
  * Thomas I of Constantinople, Patriarch from 607 to 610
  * Thomas I of Jerusalem, Patriarch until 821
  * Thomas I of York (died in 1100)
  * Thomas I, Count of Savoy (1178–1233)
  * Thomas I d'Autremencourt (died ca. 1212), Lord of Salona
  * Thomas I, Archbishop of Esztergom (1224)
  * Thomas I of Saluzzo (died in 1296)
  * Thomas I Komnenos Doukas (c. 1285–1318)
  * Baselios Thomas I (1929– )
  