Timothy I may refer to:
- Pope Timothy I of Alexandria, Pope of Alexandria & Patriarch of the See of St. Mark in 378–384
- Timothy I of Constantinople, Patriarch of Constantinople in 511–518
- Timothy I (Nestorian patriarch), Catholicus-Patriarch of the East in 780–823
- Timotheus I of Jerusalem, patriarch in 1935–1955
- The First Epistle to Timothy
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