In ancient Greek religion and myth, Eubuleus is a god known primarily from devotional inscriptions for mystery religions. The name appears several times in the corpus of the so-called Orphic gold tablets spelled variously, with forms including Euboulos, Eubouleos and Eubolos. It may be an epithet of the central Orphic god, Dionysus or Zagreus, or of Zeus in an unusual association with the Eleusinian Mysteries. Scholars of the late 20th and early 21st centuries have begun to consider Eubuleus independently as "a major god" of the mysteries, based on his prominence in the inscriptional evidence. His depiction in art as a torchbearer suggests that his role was to lead the way back from the Underworld.

The Eleusinian Mysteries were initiations held every year for the cult of Demeter and Persephone based at the Panhellenic Sanctuary of Eleusis in ancient Greece. They are considered the "most famous of the secret religious rites of ancient Greece". Their basis was a Bronze Age agrarian cult, and there is some evidence that they were derived from the religious practices of the Mycenean period. The Mysteries represented the myth of the abduction of Persephone from her mother Demeter by the king of the underworld Hades, in a cycle with three phases: the descent (loss), the search, and the ascent, with the main theme being the ascent of Persephone and the reunion with her mother. It was a major festival during the Hellenic era, and later spread to Rome. Similar religious rites appear in the agricultural societies of the Near East and in Minoan Crete.