Kirilo I or Saint Kirilo of Serbia, was the patriarch of the Serbian Orthodox Church from 1407 to 1419.^[1]

Kirilo became head of the Serbian National Church after the death of Patriarch Danilo IV at a time when Medieval Serbia was still recovering from the Battle of Kosovo and the young despot Stefan Lazarević was facing vaiorus enemies.^{[citation needed]}

According to one chronicle, Patriarch Kirilo died between 1 September 1418 and 31 August 1419, and in one prologue the date of death of Patriarch Kirilo was stated 27 December 1418.^[2]

He is venerated on 12 September.^[3]