"The stuff that dreams are made of" is a line of dialog from The Maltese Falcon. It is a reference to a line from Shakespeare's play The Tempest: "We are such stuff as dreams are made on, and our little life is rounded with a sleep."
It may also refer to:
The Stuff That Dreams Are Made Of (album), a collection of old-time music by various artists (2006) The Stuff That Dreams Are Made Of (film), a German movie directed by Alfred Vohrer (1972) "The Stuff That Dreams Are Made Of" (song), a song by Carly Simon from her album Coming Around Again (1987)