Dionysus (, Dionysos) was the god of the grape harvest, winemaking and wine, of ritual madness and ecstasy in Greek mythology. His name in Linear B tablets shows he was worshipped from c. 1500—1100 BC by Mycenean Greeks: other traces of Dionysian-type cult have been found in ancient Minoan Crete. His origins are uncertain, and his cults took many forms; some are described by ancient sources as Thracian, others as Greek. In some cults, he arrives from the east, as an Asiatic foreigner; in others, from Ethiopia in the South. He is a god of epiphany, "the god that comes", and his "foreignness" as an arriving outsider-god may be inherent and essential to his cults. He is a major, popular figure of Greek mythology and religion, and is included in some lists of the twelve Olympians. His festivals were the driving force behind the development of Greek theatre. He is an example of a dying god.

Bacchus ist:

• ein antiker römischer Weingott, siehe Bacchus
• der Name eines frühchristlichen Märtyrers (Bacchus und Sergius)
• eine Rebsorte; siehe Bacchus (Rebsorte)
• ein Asteroid; siehe (2063) Bacchus

Dionizos (gr.: lub , Dionysos) zwany też Bakchos - według mitologii greckiej bóg urodzaju i winorośli, reprezentujący nie tylko jego upajający wpływ, ale także ten dobroczynny. Syn Zeusa i śmiertelnej kobiety Semele. Jego kult przywędrował do Grecji ze Wschodu, z Tracji, około VI wieku p.n.e. Na cześć Dionizosa odbywały się Dionizje.