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