Oreste is an opera by George Frideric Handel in three acts. The libretto was anonymously adapted from Giangualberto Barlocci’s L’Oreste, which was in turn adapted from Euripides' Iphigeneia in Tauris.

Iphigenia in Tauris is a drama by the playwright Euripides, written between 414 BC and 412 BC. It has much in common with another of Euripides's plays, Helen, as well as the lost play Andromeda, and is often described as a romance, a melodrama, a tragi-comedy or an escape play.