| Acronym | Definition |
|---|
| SD | South Dakota (US postal abbreviation) |
| SD | San Diego |
| SD | Sudan (ISO country code, top level domain) |
| SD | Secure Digital |
| SD | Software Development |
| SD | Standard Definition (standard for digital video disk recorders) |
| SD | Shutdown |
| SD | Standard Deviation |
| SD | Storage Device |
| SD | Sustainable Development |
| SD | Software Developer |
| SD | Significantly Different |
| SD | Seven Days (band) |
| SD | Steward (USN Rating) |
| SD | Snoop Dogg |
| SD | Smackdown (WWE TV show) |
| SD | Scooby-Doo |
| SD | Service Delivery |
| SD | Single Dose |
| SD | Sexual Dysfunction |
| SD | Sales and Distribution (SAP) |
| SD | Sudden Death |
| SD | Survey Data (drafting and design) |
| SD | Self Defense |
| SD | Social Development |
| SD | Speed Dial |
| SD | Sample Data |
| SD | Slam Dunk |
| SD | Sprague-Dawley (laboratory rat strain) |
| SD | Sweet Dreams |
| SD | Super Duty (automobiles) |
| SD | Sheriff's Department |
| SD | Silenced (weapon) |
| SD | Send Data |
| SD | Scleroderma (connective tissue disease) |
| SD | Senior Director |
| SD | Software Documentation |
| SD | Steely Dan |
| SD | Stable Disease |
| SD | Social Distortion (band) |
| SD | Service Description |
| SD | Sega Dreamcast |
| SD | Self-Destruct |
| SD | Sicherheitsdienst (German Security Department, WWII) |
| SD | Security Deposit |
| SD | Storm Drain |
| SD | Smoke Detector |
| SD | State Director |
| SD | Snare Drum |
| SD | Speed Demon |
| SD | Slobodna Dalmacija (Croatian newspaper) |
| SD | Source/Drain |
| SD | Science Data |
| SD | Security Descriptor (Windows 2000) |
| SD | Senior Discount |
| SD | Shinedown (band) |
| SD | Smart Devices |
| SD | System Description |
| SD | Seiken Densetsu (game) |
| SD | Salvia Divinorum (entheogenic spice) |
| SD | Shipping Date |
| SD | Step-Daughter |
| SD | Soap Dispenser |
| SD | System Device |
| SD | Spectral Data |
| SD | Super Deformed (anime) |
| SD | Sekolah Dasar (Indonesian elementry school) |
| SD | Snow Day |
| SD | Service Director |
| SD | Structured Design |
| SD | Social Desirability |
| SD | Signal Degrade |
| SD | System Display |
| SD | Shaolin-Do (martial arts) |
| SD | Star Destroyer (Star Wars) |
| SD | Spirit Detective (anime) |
| SD | Same Difference |
| SD | Study Director |
| SD | Special Duty |
| SD | Safe Driver |
| SD | Speed Disk (Norton Utilities) |
| SD | Schweizer Demokraten (Swiss Democrats) |
| SD | Solar Diffuser |
| SD | Spasmodic Dysphonia |
| SD | Sudan Airways (IATA airline code) |
| SD | Standard Duty (6 axle diesel locomotive) |
| SD | Shine-Dalgarno (genetics sequence) |
| SD | Sine Die (Without A Day, fixed) |
| SD | Senate Document |
| SD | Siamese Dream (Smashing Pumpkins album) |
| SD | Single Density |
| SD | Superior Defender (anime) |
| SD | Shipping Department |
| SD | Sanjay Dutt (Indian actor) |
| SD | Survey Department |
| SD | Supply Depot (Starcraft) |
| SD | Sudanese Dinar |
| SD | Space Division |
| SD | social drinker |
| SD | Search Depth |
| SD | Sandy Denny (singer) |
| SD | Spatial Disorientation |
| SD | Supporting Document |
| SD | Specially Denatured (alcohol for cosmetics) |
| SD | Skin Dose |
| SD | Situation Display |
| SD | Service Dress |
| SD | System Demonstration |
| SD | Socratic Dialogue |
| SD | Stick Death (cartoon) |
| SD | Signed Digit |
| SD | Smoke Damper (HVAC systems) |
| SD | Sectional Density |
| SD | Schematic Description (Bell System) |
| SD | Sans Date (French: No Date) |
| SD | Stage Direction (theater) |
| SD | Spectral Decomposition |
| SD | Spiral Development (effort) |
| SD | Super Dense |
| SD | Spin Dynamics |
| SD | Senior Deacon |
| SD | Scoping Document |
| SD | Sight Draft |
| SD | Soul Decision (band) |
| SD | Siemens Dematic |
| SD | Solicitation Document |
| SD | Sphere Decoding |
| SD | Social Day |
| SD | Shadowdale (MUD) |
| SD | Sidereal Day (orbital mechanics) |
| SD | Systems Diagram |
| SD | Solar Dynamics |
| SD | Synthetic Division |
| SD | Sample Duplicate |
| SD | Supply Duct |
| SD | Site Defense |
| SD | Stream Density |
| SD | Saturation Degree |
| SD | Suspense Date |
| SD | Selection Diversity |
| SD | Shoulder-Disarticulation (amputation) |
| SD | Superdreadnought (Honor Harrington science fiction novels) |
| SD | Super Dreadnought (naval and sci-fi space navy warship class) |
| SD | Super Domain |
| SD | Schizotypal Disorder |
| SD | Stream Detection |
| SD | Southern Durchmusterung (star catalogue) |
| SD | Static Displacement |
| SD | Speciale Diensten (Dutch) |
| SD | Sweep Duration |
| SD | Span Destination (Cisco) |
| SD | Solvent Desorption |
| SD | Submittal Description |
| SD | Schedule Deviation |
| SD | Structures and Deduction (ICALP Workshop) |
| SD | Service Duct |
| SD | Section Disparu (French: Section That Does Not Exist, from TV show Alias) |
| SD | Slightly Damned (web comic) |
| SD | Salutem Dicit (Latin: sends greetings) |
| SD | Safe, Detected Failure |
| SD | Surface Duct |
| SD | Staff Digest |
| SD | Start Descent |
| SD | Smith-Dorrien (General Sir Horace Smith-Dorrien) |
| SD | Shadow Development |
| SD | Shivan Destroyer (FreeSpace 2 game) |
| SD | Sparklet Devices (.50 caliber ammunition headstamp) |
| SD | Scorned Death (Shadowbane guild) |
| SD | Spartan Dominion (forum) |
| SD | South Departure (aviation) |
| SD | Sacrum Diis (Latin: Consacrated to the Gods, epigraphy) |
| SD | Super Compact Disk (Toshiba/Time Warner) |
| SD | Set Decipherable |
| SD | Senatus Decreto (Latin: By Decree of Senate, epigraphy) |
| SD | Archive and Dissemination Office (NIMA) |
| SD | Stationary Disturbance |
| SD | Savane Développement (French) |
| SD | Sith Domination (gaming clan) |
| SD | Spider Duel (gaming, Subspace/Continuum) |
| SD | Synchronization Directorate |
| SD | Sound Dampened/Diffused (weapons) |
| SD | Shabeellada Dhexe (postal region, Somalia) |
| SD | Saigon Dentist (website and forum) |