Milieu is the French word for environment.

Milieu may refer to:

• Social environment
• Milieu (literature), in literature and sociology the cultural environment that an individual lives in
• Milieu (chemistry), in chemistry and biology the surplus or shortage of electrons in a solution, for example, base or acid
• Milieu Therapy, a form of psychiatric therapy for children.
• The Sentient Milieu, a cooperative group of species from the Star Control fictional universe.
• The Galactic Milieu Series, a science fiction series by Julian May.
• Milieu (Musician), the electronic musician