List of saints named Leo
St. Leo may refer to one of several saints named Leo, including:
- Leo of Patara, early Christian martyr
- Leo of Montefeltro, bishop of Montefeltro
- Pope Leo I the Great, Pope of Rome
- Emperor Leo I the Great, Eastern Roman Emperor
- Leo of Cappadocia
- Pope Leo II, Pope of Rome
- Leo of Catania, Wonderworker and bishop of Catania in Sicily
- , France, feast day March 1
Eastern Orthodox
- Leo of Optina, hieroschemamonk and elder of Optina Monastery
- Lev Egorov, archimandrite and hieromartyr
Roman Catholic
- Pope Leo III, Pope of Rome
- Pope Leo IV, Pope of Rome
- Pope Leo IX, Pope of Rome