| SIEF | Saskatchewan Indian Equity Foundation | |
| SIEF | Second Injury and Enhancement Fund | |
| SIEF | Secondary Injury Enhancement Fund | |
| SIEF | Substance Information Exchange Fora | |
| SIEF | Shriners International Education Foundation | |
| SIEF | Shriners International Education Foundation | |
| SIEF | Shriners International Education Foundation | |
| SIEF | Scuola Italiana Enrico Fermi | |
| SIEF | Science Insights Education Frontiers | |
| SIEF | Science Insights Education Frontiers | |
| SIEF | Substance Information Exchange Forums | |
| SIEF | Summer Internship Experience Fund | |
| SIEF | Sustainability Innovation Engagement Fund | |
| SIEF | Sino International Entrepreneurs Federation | |
| SIEF | Sino International Entrepreneurs Federation | |
| SIEF | Simultaneous Implant Exchange and Fat | |
| SIEF | Seoul International Electric Fair | |
| SIEF | Seoul International Electric Fair | |
| SIEF | Saskatchewan Indigenous Enterprise Foundation | |
| SIEFA | Socio-Economic Indexes for Areas | |
| SIEFAR | Société Internationale pour l'Étude des Femmes de l'Ancien Régime | |
| SIEFAR | International Association for the Study of Women in the Ancien Régime | |
| SIEFORE | Sociedad de Inversión Especializada en FOndos para el REtiro | |
| SIEG | Shanxi International Electricity Group | |
| SIEGE | Smoking Induced Epithelial Gene Expression |
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