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Tier 3 may refer to:
- Tier 3 (nightclub), in New York, U.S.
- Tier 3 of the First COVID-19 tier regulations in England, the highest level
- Tier 3 of the Second COVID-19 tier regulations in England
- Tier 3 Railway lines in Australia
- Tier III, a data center standard
- Tier 3 in United States vehicle emission standards