Venerable Sergius of Radonezh (Russian: ??´???? ??´?????????, Sergii Radonezhsky; 14 May 1314 – 25 September 1392), also transliterated as Sergiy Radonezhsky or Serge of Radonezh, was a spiritual leader and monastic reformer of medieval Russia.
Together with Venerable Seraphim of Sarov, he is one of the Russian Orthodox Church's most highly venerated saints.