TEU may refer to:
- Twenty-foot equivalent unit, a measure used for capacity in container transportation
- Treaty on European Union, formal name of the Maastricht Treaty (1992) on the creation of the euro
- New Zealand Tertiary Education Union, formed by the amalgamation of the Association of Staff in Tertiary Education and the Association of University Staff of New Zealand
- Manapouri Aerodrome, IATA code TEU