TIER may refer to:
- Taiwan Institute of Economic Research, one of two major economic research institutes in Taiwan
Tier may refer to:
- a layer or ranking or classification-group in any real or imagined hierarchy
- a layer in a multitiered software architecture
- tier (emission standard), one of a set of standards in the United States for vehicle emissions
- data center tiers, availability levels (called tiers) of data centers in a thorough, quantifiable manner
- A level in a sports league system
- A group of cable networks offered bundled together to potential subscribers, rather than separately
- Tier (song), by German band Rammstein
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