| SIW | Impact Windows 
| Others |
| SIW | Scuola Italiana Wrestling
| Others |
| SIW | Self Inlficted Wounds
| Others |
| SIW | Self-Inflicted Wound
| Others |
| SIW | Server in Waiting
| Others |
| SIW | Service Implementation Workbench
| Others |
| SIW | Share Ideas Willingly
| Others |
| SIW | Short Instruction Word
| Others |
| SIW | Sie Ist Wilkommen
| Others |
| SIW | Silver Wraith
| Others |
| SIW | Simulation Innovation Workshop
| Others |
| SIW | Simulation Interoperability Workshop
| Others |
| SIW | SImulation Works, Inc.
| Others |
| SIW | Single Input Wire
| Others |
| SIW | Slovenian Incoming Workshop
| Others |
| SIW | Smithsonian World
| Others |
| SIW | Socialist International Women
| Others |
| SIW | Soil and Irrigation Water
| Others |
| SIW | Solar Installers of Washington
| Others |
| SIW | Soldier In Wonderland
| Others |
| SIW | Soweit Ich Beiss
| Others |
| SIW | Space Internet Workshop
| Others |
| SIW | Spoof In the Wild
| Others |
| SIW | Stanford In Washington
| Others |
| SIW | Strong Independent Woman
| Others |
| SIW | Substrate Integrated Waveguide
| Others |
| SIW | Super Internet Wrestling
| Others |
| SIW | Syed Ifthekhar Wali
| Others |
| SIW | System Information for Windows
| Others |