Idée fixe may refer to:
Idée fixe (psychology), a psychological disorder Idée Fixe (album), a 1978 album by Aerolit Dogmatix, the English name of an Asterix comics character, called Idéfix in French Idée fixe (music), a recurring theme or motif, as in the Symphonie fantastique by Hector Berlioz
See also Fixation (disambiguation) Leitmotif, a recurring musical phrase used as an element of musical structure