| S&AD | Science and Applications Directorate 
| Others |
| SAD | Sadi S. p. A.
| Others |
| SAD | Safely Allowed Drop
| Others |
| SAD | Saints Absolutely Deceived
| Others |
| SAD | Sandawe
| Others |
| SAD | Sascha Alexander Dettweiler
| Others |
| SAD | School And Design
| Others |
| SAD | School of Architecture and Design
| Others |
| SAD | Science Art Design
| Others |
| SAD | Scientifically Aided Design
| Others |
| SAD | Season Affective Disorder
| Others |
| SAD | Seasonal Affecfive Disorder
| Others |
| SAD | Seasonal Affected Disorder
| Others |
| SAD | Seasonal affective
| Others |
| SAD | Seasonal Affective Disorder
| Others |
| SAD | Seasonal Allergy Distress
| Others |
| SAD | Secure Agent Development
| Others |
| SAD | Secure Autonomous Driving
| Others |
| SAD | Security Administration
| Others |
| SAD | Security Association Database
| Others |
| SAD | Seek and Destroy
| Others |
| SAD | Selected Area Diffraction
| Others |
| SAD | Semi Active Damper
| Others |
| SAD | Semi Autonomous Driving
| Others |
| SAD | Separation Anxiety Disorder
| Others |
| SAD | Serveron Analyzer data
| Others |
| SAD | Service Administrative Driver
| Others |
| SAD | Severe Acronym Deficiency
| Others |
| SAD | Shapes And Designs
| Others |
| SAD | Shiromani Akali Dal
| Others |
| SAD | Shocking Anxiety Development
| Others |
| SAD | Shuttle Authorized Document
| Others |
| SAD | Silicon Avalanche Diode
| Others |
| SAD | Silly And Disruptive
| Others |
| SAD | Simple Anxiety Defect
| Others |
| SAD | Simple Anxiety DefectB
| Others |
| SAD | Sindicatul Automobile Dacia
| Others |
| SAD | Single Administrative Document
| Others |
| SAD | Single Ascending Dose
| Others |
| SAD | Single Awareness Day
| Others |
| SAD | Single, Available, and Desperate
| Others |
| SAD | Singles Awareness Day
| Others |
| SAD | Sinoaortic denervation or deafferentiation
| Others |
| SAD | Situation Awareness Display
| Others |
| SAD | Situational Affected Depression
| Others |
| SAD | Skoda Auto Deutschland
| Others |
| SAD | Smart Ack Dropper
| Others |
| SAD | Social Anxiety Disorder
| Others |
| SAD | Socrates Action Day
| Others |
| SAD | Solar Array Deployment
| Others |
| SAD | Sons and Daughters
| Others |
| SAD | Soul Assassin Demon
| Others |
| SAD | Source to Axis Distance
| Others |
| SAD | Source-Axis Distance
| Others |
| SAD | South Atlantic Division
| Others |
| SAD | Space Artillery Drill
| Others |
| SAD | Spacecraft Attitude Display
| Others |
| SAD | Special Activities Database
| Others |
| SAD | Special Activities Division
| Others |
| SAD | Special Assessment District
| Others |
| SAD | Spring Alfa Day
| Others |
| SAD | Stand Alone Device
| Others |
| SAD | Stand Alone Dump
| Others |
| SAD | Stand For Acronym Database
| Others |
| SAD | Standard American Diet
| Others |
| SAD | Stone Age Designs
| Others |
| SAD | Stoned And Drugged
| Others |
| SAD | Stoupa Addiction Disorder
| Others |
| SAD | Strategic Accelerator Design
| Others |
| SAD | Stress Anxiety and Depression
| Others |
| SAD | Stress, Anxiety, and Depression
| Others |
| SAD | Stroke And Distance
| Others |
| SAD | Strosek Auto Design
| Others |
| SAD | Students Affairs Department
| Others |
| SAD | Students Against Discrimination
| Others |
| SAD | Subacromial decompression
| Others |
| SAD | Suicidal And Depressed
| Others |
| SAD | Sum of Absolute Differences
| Others |
| SAD | Summons Alert Days
| Others |
| SAD | Suppen Ale Doon
| Others |
| SAD | Supplementary Alteration Drawing
| Others |
| SAD | Supply Action Date
| Others |
| SAD | Supply Air Damper
| Others |
| SAD | Supply Air Diffuser
| Others |
| SAD | Supply Air Duct
| Others |
| SAD | Surprise And Delight
| Others |
| SAD | Swallow Arrival Day
| Others |
| SAD | Swimming Animals Depressed
| Others |
| SAD | Swinford Anxiety Disorder
| Others |
| SAD | System Allocation Document
| Others |
| SAD | System Analysis and Design
| Others |
| SAD | Systems Allocation Document
| Others |
| SAD | Systems Analysis and Design
| Others |
| SAD | ugar-acetone-diacetic acid test
| Others |