SIEF
| Acronym | Definition |
|---|---|
| SIEF | Substance Information Exchange Forum |
| SIEF | Societe Internationale d'Ethnologie et de Folklore (French) |
| SIEF | Saskatchewan Indian Equity Foundation (Regina, Saskatchewan, Canada) |
| SIEF | Society for Ethnology and Folklore (Meertens Institute; Amsterdam, Netherlands) |
| SIEF | Seoul International Electric Fair (South Korea) |
| SIEF | Secondary Injury Enhancement Fund (Canada) |