| Acronym | Definition |
|---|
| SIWC➣Sydney International Wine Competition |
| SIWC➣Sexual Intercourse without Consent (Montana) |
| SIWC➣Soroptimist International of Washoe County (Reno, NV) |
| SIWC➣Sanibel Island Writers Conference |
| SIWC➣Shanghai International Wine Challenge (wine competition; Shanghai International Wine and Spirits Fair; Shanghai, China) |
| SIWC➣Seaborne Information Warfare Course |