HY
| Acronym | Definition |
|---|---|
| HY | Henry |
| HY | Hydraulic |
| HY | Hitler Youth |
| HY | Helsingin Yliopisto (Finnish: University of Helsinki) |
| HY | Half Yearly |
| HY | Hundred Yards |
| HY | Hell Yeah |
| HY | Hygromycin |
| HY | High Yield Strength (steel) |
| HY | Uzbekistan Havo Yullary (Uzbekistan Airways, IATA airline code) |
| HY | Hey Yall |