St. Leo may refer to one of several saints named Leo, including:
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Pope Leo I
Pope Leo I ( 400 – 10 November 461), also known as Leo the Great, was bishop of Rome from 29 September 440 until his death. Pope Benedict XVI said that Leo's papacy "was undoubtedly one of the most important in the Church's history."
Leo was ...
(d. 461), pope and saint
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Pope Leo II
Pope Leo II ( – 28 June 683) was the bishop of Rome from 17 August 682 to his death. He is one of the popes of the Byzantine Papacy. Described by a contemporary biographer as both just and learned, he is commemorated as a saint in the Roman Ma ...
(d. 683), pope and saint
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Pope Leo III (d. 816), pope and saint
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Pope Leo IV (d. 855), pope and saint
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Pope Leo IX
Pope Leo IX (21 June 1002 – 19 April 1054), born Bruno von Egisheim-Dagsburg, was the head of the Catholic Church and ruler of the Papal States from 12 February 1049 to his death in 1054. Leo IX is considered to be one of the most historically ...
(d. 1054), pope and saint
* , France
* Saint
Leo of Catania
Saint Leo of Catania, nicknamed the ''Thaumaturgus'', also known as St Leo the Wonderworker in Sicily (May 703 or 709 – 20 February 789), was the fifteenth bishop of Catania, famed also for his love and care toward the poor. His feast day occu ...
otherwise Saint Leo the Thaumaturge (d. 785), saint and bishop of Catania in Sicily
* Saint
Leo of Montefeltro (d. 366), bishop of Montefeltro
* Saint
Leo of Patara (d. 260), early Christian martyr
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Leo