Pope Dionysius (died 268) was a Greek pope.
Saint Dionysius may also refer to:
- Dionysius the Areopagite (died late first century), Greek bishop and judge of the Areopagus
- Dionysius of Corinth (died c. 171), Bishop of Corinth
- Dionysius of Paris (died c. 250), Christian martyr
- Dionysius of Alexandria (died 265), Bishop of Alexandria
- Dionysius (died 447), one of the Seven Sleepers of Ephesus
- Dionysius Exiguus (c. 470 – c. 544), Byzantine monk who invented AD dating
- Dionysius Vattasseril (1858–1934), or Dionysius of India, primate of the Indian Orthodox Church
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