"The Impossible Dream (The Quest)" is a popular song composed by Mitch Leigh, with lyrics written by Joe Darion. The song is the most popular song from the 1965 Broadway musical Man of La Mancha and is also featured in the 1972 film of the same name starring Peter O'Toole.
The complete song is first sung by Don Quixote as he stands vigil over his armor, in response to Aldonza (Dulcinea)'s question about what he means by "following the quest". It is reprised partially three more times – the last by prisoners in a dungeon as Miguel de Cervantes and his manservant mount the drawbridge-like prison staircase to face trial by the Spanish Inquisition.
A version recorded by Jack Jones peaked at No. 35 on the U.S. Billboard Hot 100 chart and reached No. 1 on the Easy Listening chart.
Leigh received the Contemporary Classics Award from the Songwriter's Hall of Fame for the song.