Thomas I
# 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– )
