Expression may refer to:

• Idiom
• Facial expression
• Artificial discharge of breast milk; see (Breastfeeding)
• Expression (mathematics)
• Expression (programming), an instruction to execute something that will return a value.
• Microsoft Expression Studio, a graphic design and digital media computer software suite.
• Gene expression, in biochemistry and genetics
• Emotional expression, in psychology
• Expression marks, in music notation for articulation, dynamics, octaves, ornaments, or tempo
• A John Coltrane album
• The act of expressing, as with a ram press (food)
• Ex'pression College for Digital Arts, a small version of Full Sail University, based in Emeryville, California

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