| Acronym | Definition |
|---|
| SID | Semel in Die (Latin: Once A Day) |
| SID | Society for Information Display |
| SID | Sports Information Director |
| SID | Security Identifier |
| SID | Special Improvement District |
| SID | Society for International Development |
| SID | Shared Information & Data (model) |
| SID | Society for Investigative Dermatology |
| SID | Sudden Infant Death |
| SID | Sensory Integration Disorder |
| SID | System Identifier |
| SID | Sensory Integration Dysfunction |
| SID | Standard Instrument Departure |
| SID | SecurID |
| SID | Session Identifier |
| SID | Source ID |
| SID | Sound Interface Device |
| SID | Specialarbejderforbundet I Danmark (Denmark) |
| SID | Student Identification Number |
| SID | Service Identifier |
| SID | Station Identification |
| SID | Sudden Ionospheric Disturbance |
| SID | State Identification Number |
| SID | Saab Information Display |
| SID | Subscriber Identification |
| SID | Source-to-Image Distance (radiology) |
| SID | Station Identifier |
| SID | Side Impact Dummy (auto crash testing) |
| SID | Situation Display |
| SID | Special Investigation Division |
| SID | Strong Ion Difference (medical interpretation of complex acid base problems) |
| SID | Surface-Induced Dissociation (mass spectrometry) |
| SID | State Inpatient Database |
| SID | Social Intelligence Design |
| SID | Silence Insertion Descriptor |
| SID | Safety in Design |
| SID | Systems Integration Division |
| SID | Security in Depth |
| SID | Supplier Information Database |
| SID | Special Investigation Department (Thailand) |
| SID | Sociedad Internacional para el Desarrollo (Spanish) |
| SID | Symbolic Interactive Debugger |
| SID | Singular Indestructible Droid (song) |
| SID | Spatially Immersive Display |
| SID | Sanitary Improvement District |
| SID | Secondary Imagery Dissemination |
| SID | Strategies for International Development (Arlington, VA) |
| SID | Société Internationale pour le Développement (French) |
| SID | System Interface Document |
| SID | Sal, Cape Verde - Amilcar Cabral International (Airport Code) |
| SID | Systemic Inflammatory Disease |
| SID | Système d'information Douanier (French: Customs Information System) |
| SID | Swift Interface Device |
| SID | Sadistic, Intelligent, Dangerous |
| SID | Street Improvement District |
| SID | Société Industrielle de Diffusion (French: Industrial Distribution Company) |
| SID | Structure Identifier |
| SID | Spectral Information Divergence |
| SID | Slew Induced Distortion |
| Sid | Sidetic (linguistics) |
| SID | Ship Installation Drawing |
| SID | Structural Interior Design (US Army Corps of Engineers) |
| SID | Switch Identifier |
| SID | Satellite Identifier |
| SID | Substitution, Insertion, Deletion |
| SID | Serial Interface Device |
| SID | System Interface Description |
| SID | Standard Interface Document |
| SID | Scheduled Implementation Date |
| SID | Send Identifier |
| SID | Services Innovants pour Personnes Dépendantes (French: Innovative Services for Dependent Persons) |
| SID | Sodium Ionization Detector |
| SID | Software Independent Data |
| SID | Sequence Information Data |
| SID | Standard Information Display |
| SID | Source Image Distances |
| SID | Subsea Intervention Device |
| SID | Satellite Infiltration Drone (Knight Rider TV show) |
| SID | Standard Integrated Desktop |
| SID | Supplementary Irish Draught (horse breed) |
| SID | System Identifier for the Database Instance (Oracle) |
| SID | Security Investigation Division |
| SID | System Interface Diagram |
| SID | Service Industries Division |
| SID | Skin Irritant Decontaminant |
| SID | Sequence Interaction Diagram |
| SID | Service Information Dataset |
| SID | Silent Indicator Description |
| SID | Strategic Intelligence Digests |
| SID | Security Investigations Division (Armed Forces Retirement Home) |
| SID | Shuffled Iterative Decoding |
| SID | Seismic Intrusion Detector/Device |
| SID | Solomon Island Dollar (national currency) |
| SID | Stammdaten Identifikationsnummer (German) |
| SID | Strip Interior Diffraction |
| SID | Satisfactory Implementation of Design |
| SID | System Information Directory |
| SID | Strip of Initial Definition |
| SID | Systems Inventory Database |
| SID | Scientific Investigation Division (law enforcement; various locations) |
| SID | Senior Independent Director (various organizations) |
| SID | Safer Internet Day (Insafe) |
| SID | Specimen Image Database (biodiversity research) |