Cyclops is an ancient Greek satyr play by Euripides, based closely on an episode from the Odyssey. It would have been the fourth part of a tetralogy presented by Euripides in a dramatic festival in 5th Century BC Athens. The date of its composition is unknown, but it was probably written late in Euripides' career. It is the only complete satyr play extant.

The satyr play is a form of Attic theatre performance related to both comedy and tragedy. It preserves theatrical elements of dialogue, actors speaking verse, a chorus that dances and sings, masks and costumes. Its relationship to tragedy is strong; satyr plays were written by tragedians, and satyr plays were performed in the Dionysian festival following the performance of a group of three tragedies. The satyr play's mythological-heroic stories and the style of language are similar to that of the tragedies. Its connection with comedy is also significant – it has similar plots, titles, themes, characters, and happy endings. The remarkable feature of the satyr play is the chorus of satyrs, with their costumes that focus on the phallus, and with their language, which uses wordplay, sexual innuendos, references to breasts, farting, erections, and other references that do not occur in tragedy. As Mark Griffith points out, the satyr play was "not merely a deeply traditional Dionysiac ritual, but also generally accepted as the most appropriate and satisfying conclusion to the city’s most complex and prestigious cultural event of the year."