Sergius I

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 864)
 * Sergius I of Amalfi (died 966)
 * Patriarch Sergius I of Moscow (1867–1944)