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)