SEY
| Acronym | Definition |
|---|---|
| SEY | Air Seychelles (ICAO code) |
| SEY | Secondary Electron Yield |
| SEY | Search Engine Yearbook (Andre le Roux guidebook) |
| SEY | Selenium-Enriched Yeast |
| SEY | Second Emission Yield |
| SEY | Sexually Exploited Youth Program (Marymound; Winnipeg, Manitoba, Canada) |