choral song in honour of the wine god Dionysus. The form was known as early as the 7th century BC in Greece, where an improvised lyric was sung by banqueters under the leadership of a man who, according to the poet Archilochus, was “wit-stricken by the thunderbolt of wine.” It was contrasted with the more sober paean, sung in honour of Apollo. The word's etymology is uncertain, although, like other words that end in amb, it seems to be of pre-Hellenic origin.

The dithyramb began to achieve literary distinction about 600 BC, when, according to the Greek historian Herodotus, the poet Arion composed works of this type, named the genre, and formally presented them at Corinth. In the last decades of the 6th century BC in Athens, during the tyranny of Peisistratus, a dithyrambic competition was officially introduced into the Great Dionysia by the poet Lasus of Hermione. Dithyrambs were also performed at other festivals. The performance of dithyrambs was grandiose and spectacular: after a prologue spoken by the group's leader, two choruses in expensive apparel—one of 50 men and the other of 50 boys—sang and performed circle dances around the altar of Dionysus. Auloi (aulos) (wind instruments with double reeds) provided the instrumental accompaniment.

The great age of the dithyramb was also the period of the flourishing of the Greek choral lyric in general. Simonides (Simonides of Ceos), Pindar, and Bacchylides all composed them. Little is known of the dithyrambs of Simonides, whom a Hellenistic epigram credited with 56 victories, but papyrus discoveries have supplied two complete dithyrambs of Bacchylides along with considerable fragments of Pindar's work. Bacchylides' ode 18 is unusual because it includes a dialogue between a chorus and a soloist. At one time scholars associated the dramatic and mimetic structure of this ode with Aristotle's famous assertion in Poetics that tragedy originated from improvisation by the leaders of the dithyramb; however, many contemporary scholars see the poem's use of dialogue for dramatic interest as a sign of the dithyramb's surrender to the more vivid methods of tragedy.

From about 450 BC onward, dithyrambic poets such as Timotheus, Melanippides, Cinesias, and Philoxenus employed ever more startling devices of language and music until for ancient literary critics dithyrambic acquired the connotations of “turgid” and “bombastic.” True dithyrambs are rare in modern poetry, although John Dryden (Dryden, John)'s "Alexander's Feast" (1697) may be said to bear a coincidental resemblance to the form. The poets of the French Pléiade (Pléiade, La) (16th century AD) used the term to describe some of their poetry, as did the Italian physician and poet Francesco Redi (Redi, Francesco) for his "Bacco in Toscana" (1685; “Bacchus 【Dionysus】 in Tuscany”).

The term may also refer to any poem in an inspired irregular strain, or to a statement or piece of writing in an exalted impassioned style, usually in praise of a particular subject. Modern examples include Friedrich Nietzsche's Dithyrambs of Dionysus (1891) and Gabriele d'Annunzio's "Alcyone" (1904).