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
 
See also
- Multitier architecture
 - WTA Tier III tournaments, Women's Tennis Association tennis third-level tournaments
 - Three-tier system (disambiguation)
 - Tier III- (Tier 3 minus), an unmanned aerial vehicle
 - Tier 1 (disambiguation)
 - Tier 2 (disambiguation)
 - Tier 4 (disambiguation)
 
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