| Acronym | Definition |
|---|
| SIL | Summer Institute of Linguistics |
| SIL | Silver |
| SIL | Safety Integrity Level |
| SIL | Silent |
| SIL | Silence (logging abbreviation) |
| SIL | Sister-In-Law |
| SIL | Son-In-Law |
| SIL | Squamous Intraepithelial Lesion |
| SIL | Société Internationale de Linguistique |
| SIL | Service Information Letter |
| SIL | Single In-Line |
| SIL | Societas Internationalis Limnologiae |
| SIL | Solid Immersion Lens |
| SIL | Services for Independent Living |
| SIL | So in Love |
| SIL | System Integration Laboratory |
| SIL | Sound Intensity Level |
| SIL | Speech Interference Level |
| SIL | Sing It Loud (band) |
| SIL | Special Import License |
| SIL | Standard Interchange Language |
| SIL | Sleeping in Light (Babylon 5 TV series final episode) |
| SIL | South Island Line (Hong Kong) |
| SIL | Space Innovations Limited |
| SIL | Surge Impedance Loading |
| SIL | Self Instruction Lab |
| SIL | Software Integration Laboratory |
| SIL | Système d'Information Sur La Législation (French: System of Information on Legislation; Switzerland) |
| SIL | Survivability Integration Laboratory |
| SIL | Software-in-Loop (application) |
| SIL | Simon India Limited (New Delhi, India) |
| SIL | Simulation Integration Laboratory |
| SIL | Strategic Industrial Location |
| SIL | Storhamar Idrettslag |
| SIL | Seriously Ill List |
| SIL | Selected Item List |
| SIL | Semiconductor Injection Laser |
| SIL | Services International Limited (India) |
| SIL | Sistema Informativo Lavoro (Italian: Work Information System; database) |
| SIL | Stated Income Loan (mortgages) |