The Graeco-Roman name Dionysius
, deriving from the name of the Thracian god Dionysus
, was exceedingly common, and many ancient people, famous and otherwise, bore it. It remains a common name today in the form Dennis
Among the persons known by the name Dionysius, some of the more famous were:
- Dionysius the Elder (or Dionysius I), ruler of Syracuse in Sicily
- Dionysius the Younger, (or Dionysius II), son of the preceding
- Dionysius of Phocaea, commander of the Ionian fleet at the Battle of Lade, 494 BC
- Dionysius Chalcus, Athenian elegiac poet, 5th century BC
- Dionysius of Heraclea, tyrant of Heraclea Pontica, 4th century BC
- Dionysius (Athenian Commander), an Athenian naval commander during the Corinthian War
- Dionysius the Renegade, Stoic philosopher from Heraclea who became a Cyrenaic, c. 300 BC.
- Dionysius (ambassador), 3rd century BC, ambassador to the court of the Indian ruler Ashoka.
- Dionysius Thrax, Greek grammarian, 2nd century BC
- Dionysius of Cyrene, Stoic philosopher and mathematician, c. 150 BC.
- Dionysius, a lector and martyr of Alexandria - see Faustus, Abibus and Dionysius of Alexandria
- Dionysius the Areopagite, Athenian judge who was converted by Paul of Tarsus and became Bishop of Athens
- Dionysius Periegetes, Greek geographer, 2nd or 3rd century
- Dionysius of Halicarnassus, Greek historian of the Roman period
- Saint Dionysius of Alexandria, 3rd century Egyptian bishop
- Dionysius, Bishop of Corinth, 2th century bishop
- Saint Denis, Bishop of Paris, martyr (died ca. 250)
- Pope Dionysius (259–268)
- Dionysius of Alba, 4th-century bishop.
- Dionysius Exiguus, (c. 470–c. 540) monk from Scythia Minor who invented the Anno Domini era
- Dionysius Telmaharensis, (d. 848) former head of the Syrian Jacobite Church
- Jacob Bar-Salibi also known as Dionysius Bar-salibi, member of Syrian Jacobite Church in the 12th century, best known for his commentary on biblical texts
- Dionysius I, Metropolitan of Moscow (c. 1300–1385), 14th century orthodox prelate
- Dionysius the Wise, (late 15th century–early 16th century), Russian medieval icon-painter
- Denis the Carthusian (1402-1471)
- Saint Dionysios of Zakynthos, 15th century Orthodox Christian Archbishop of Aegina
- Dionysius the Philosopher, (1560 AD–1611 AD), Epirotian Greek monk who led two farmer revolts against the Ottoman Turks.
- Benjamin Musaphia (1606–1675), Jewish doctor, scholar, and kabbalist, who sometimes called himself Dionysius
- Dionysius Lardner (1793–1859), Irish scientific writer
- Aelius Dionysius, a Greek rhetorician from Halicarnassus