A tetralogy (from Greek τετρα- tetra-, "four" and -λογία -logia, "discourse") is a compound work that is made up of four distinct works. The name comes from the Attic theater, in which a tetralogy was a group of three tragedies followed by a satyr play, all by one author, to be played in one sitting at the Dionysia as part of a competition.
- Tintitives by Antiphon of Rhamnus; the author was an orator, and Tintitives is a kind of textbook for students. Each book consists of four speeches: the prosecutor's opening speech, the first speech for the defense, the prosecutor's reply, and the defendant's conclusion. Three of his tetralogies are known to have survived.
- Der Ring des Nibelungen by Richard Wagner 
- "Inheritance Cycle" by Christopher Paolini
- The Buru Quartet by Pramoedya Ananta Toer
- "Menagerie" by Christopher Golden and Thomas Sniegoski
- The Sea of Fertility by Yukio Mishima
- The Once and Future King By T.H. White
- The Ware Tetralogy by Rudy Rucker
- The Book of the New Sun by Gene Wolfe
- The History of the Runestaff by Michael Moorcock
- Rabbit Angstrom: A Tetralogy by John Updike
- Tetralogia (1975) by Dimos Moutsis
In the early modern period of literature, Shakespeare drafted a pair of tetralogies, the first consisting of the three Henry VI plays and Richard III, and the second, what we now call a prequel because it is set earlier, consisting of Richard II, the two Henry IV plays, and Henry V.
As an alternative to "tetralogy", "quartet" is sometimes used, particularly for series of four books. The term "quadrilogy", using the Latin prefix quadri- instead of the Greek, and first recorded in 1865, has also been used for marketing cinematic series, such as the Alien movies.
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- Rush Rehm. Greek Tragic Theater. Routledge, 1994, p. 16.
- C. M. Bowra. Landmarks in Greek Literature. Weidenfeld & Nicolson, 1966, pp. 236–7.
- Hans von Wolzogen. Guide to the music of Richard Wagner's tetralogy: The ring of the Nibelung. A thematic key. Translated by Nathan Haskell Dole. G. Schirmer, New York, 1895.
- Victor L. Cahn. Shakespeare the playwright: a companion to the complete tragedies, histories, comedies, and romances. Greenwood, 1991.
- Simpson, J.A., and Weiner, E.S.C. (eds.) The Oxford English Dictionary. 2nd ed. 1989. Oxford. Clarendon Press. "quadri-"