An idyll or idyl (pron.: // or //; from Greek εἰδύλλιον - eidullion, "short poem") is a short poem, descriptive of rustic life, written in the style of Theocritus' short pastoral poems, the Idylls.
Unlike Homer, Theocritus did not engage in heroes and warfare. His idylls are limited to a small intimate world, and describe scenes from everyday life. Later imitators include the Roman poets Virgil and Catullus, Italian poet Leopardi, and the English poet Alfred, Lord Tennyson (Idylls of the King). Goethe called his poem Hermann and Dorothea - which Schiller considered the very climax in Goethe's production - an idyll. 
The term is used in music to refer generally to a work evocative of pastoral or rural life such as Edward MacDowell's Forest Idylls, and more specifically to a kind of French courtly entertainment (divertissement) of the baroque era where a pastoral poem was set to music, accompanied by ballet and singing. Examples of the latter are Lully's L'Idylle sur la Paix set to a text by Racine and Desmarets' Idylle sur la naissance du duc de Bourgogne set to a text by Antoinette Deshoulières.
In the visual arts, an idyll is a painting depicting the same sort of subject matter to be found in idyllic poetry, often with rural or peasant life as its central theme. One of the earliest examples is the early 15th century Très Riches Heures du Duc de Berry. The genre was particularly popular in English paintings of the Victorian era.
See also 
- Arcadia (utopia)
- Et in Arcadia ego
- John Greenleaf Whittier, Snow-Bound: A Winter Idyl
- William Wordsworth, The Solitary Reaper
- εἰδύλλιον, Henry George Liddell, Robert Scott, A Greek-English Lexicon, on Perseus
- Gjert Vestrheim: "Hellas som ideal", Antikken i ettertiden (s. 170-2), edited by Universitetsforlaget, Oslo 2009, ISBN 978-82-15-01482-1
- Randel, Don Michael (1999). "Idyll", The Harvard Concise Dictionary of Music and Musicians. Harvard University Press, p. 312 and passim. ISBN 0-674-00084-6; Sadie, Julie Anne (1998). Companion to Baroque Music. University of California Press, p. 53. ISBN 0-520-21414-5
- Hagen, Rose-Marie and Hagen, Rainer (2002) What Great Paintings Say, Volume 1. Taschen, p.20. ISBN 3-8228-2100-4
- Treble, Rosemary (1989). "The Victorian picture of the country" in The Rural idyll (G. E. Mingay, ed.). Routledge, pp. 51-59. ISBN 0-415-03394-2
- The dictionary definition of idyll at Wiktionary