bleu or BLEU may refer to:

  • the French word for blue
  • Three Colors: Blue, a 1993 movie
  • BLEU (Bilingual Evaluation Understudy), a machine translation evaluation metric
  • Belgium–Luxembourg Economic Union
  • Bleu (musician), a member of pop-group L.E.O.
  • Blue cheese, a type of cheese
  • Deis, a character from the Breath of Fire games who is known as "Bleu" in the English versions
  • Corbin Bleu, an American actor, model, dancer and vocalist
  • Parti bleu, 19th century political group in Quebec, Canada
  • Blended Low Enrichment Uranium, a type of fuel for nuclear fission reactors