| SIFF | Seattle International Film Festival | |
| SIFF | Seattle International Film Festival | |
| SIFF | South Island Formula Ford | |
| SIFFC | South Island Formula Ford Championship | |
| SIFFS | South Indian Federation of Fishermen Societies | |
| SIFFS | Sensory Impaired Family Friends Society | |
| SIFFS | South India Federation of Fishermen Societies | |
| SIFFS | South India Federation of Fishermen Societies | |
| SIFFS | South India Federation of Fishermen Societies | |
| SIFFS | Small Indigenous Freshwater Fish Species | |
| SIFFS | South Indian Federation of Fisherman Societies | |
| SIFFS | South Indian Federation of Fisherman Societies | |
| SIFFS | South Indian Federation of Fisherman Societies | |
| SIFFS | Surin International Folklore Festival and Symposium | |
| SIFFS | Surin International Folklore Festival and Symposium | |
| SIFI | SI Financial Group, Incorporated | |
| SIFI | Systemically Important Financial Institution | |
| SIFI | Seminar in Field Instruction | |
| SIFI | Sci Fi | |
| SIFI | Systemically Important Financial Institutions | |
| SIFI | Systematically Important Financial Institution | |
| SIFI | Systemically Important Financial Institution | |
| SIFI | Systemically Important Financial Institution | |
| SIFI | Systemically Important Financial Institution | |
| SIFL | Southern Indoor Football League |
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