St. Leo may refer to one of several saints named Leo, including: Leo of Patara (died ), early Christian martyr Leo of Montefeltro (died 366), bishop of Montefeltro Pope Leo I the Great (died 461), Pope of Rome Emperor Leo I the Great (died 474), Eastern Roman Emperor Leo of Cappadocia (died ) Pope Leo II (died 683), Pope of Rome Leo of Catania (died ), Wonderworker and bishop of Catania in Sicily , France (died ), feast day March 1
Eastern Orthodox
Leo of Optina (1768–1841), hieroschemamonk and elder of Optina Monastery Lev Egorov (1889–1937), archimandrite and hieromartyr
Roman Catholic
Pope Leo III (died 816), Pope of Rome Pope Leo IV (died 855), Pope of Rome Pope Leo IX (died 1054), Pope of Rome