Adonis (Greek: Άδωνης, also: Άδωνις) is a figure of West Semitic origin, where he is a central cult figure in various mystery religions, who enters Greek mythology in Hellenistic times. He is closely related to the Egyptian Osiris, the Semitic Tammuz and Baal Hadad, the Etruscan Atunis and the Phrygian Attis, all of whom are deities of rebirth and vegetation.

Adonis was based very heavily on Tammuz. His name may be Semitic, a variation on the word "adon" meaning "lord" that was also used, as "Adonai", to refer to Yahweh in the Old Testament. When the Hebrews first arrived in Canaan, they were opposed by the king of the Jebusites, Adonizedek, whose name means "lord of Zedek" (Justice). Yet there is no surviving trace of a Semitic cult directly connected with Adonis, and no surviving evidence in Semitic languages of any specific mythemes connected with his Greek myth. The connection in cult practice is with Adonis' Mesopotamian counterpart, Tammuz.