HY or Hy may refer to:
- Armenian language ISO 639 alpha-2 code
- IATA code for Uzbekistan Airways
- An abbreviation for Helsingin yliopisto, which is Finnish for University of Helsinki
- An abbreviation for Hell Yes!
- An abbreviation for Hollywood
- An abbreviation for Henry
- HY (band), a Japanese band
- Two letter code for Hyatt hotels used by CRS
- High-Yield steel
- A gender neutral pronoun
- High yield
- Iona
- Hy Abbey, an old name for island and hence Iona Abbey
- Hy (island), an pre-Christian and early Christian name for Iona, (See the Etymology section in the link)
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