"Alysoun" or "Alison", also known as "Bytuene Mersh ant Averil", is a late-13th or early-14th century poem in Middle English dealing with the themes of love and springtime through images familiar from other medieval poems. It forms part of the collection known as the Harley Lyrics, and exemplifies its best qualities. There may once have been music for this poem, but if so it no longer survives. "Alysoun" was included in The Oxford Book of English Verse, The Norton Anthology of English Literature, and The Longman Anthology of British Literature. It has been called one of the best lyrics in the language.