| SAD | Service Action Drawing | 维修图 |
| SAD | Source-Axis Distance | 源轴距 |
| SAD | System Analysis and Design | 系统分析和设计 |
| SAD | Small Area Data | 小面积数据 |
| SAD | Silicon Avalanche Diodes | 硅雪崩二极管 |
| SAD | Sjedinjene AmeriÈke Države (Croatian: United States of America) | Sjedinjene AmeriÈke Države (Croatian: United States of America) |
| SAD | Seasonal Affective Disorder | 季节性情感障碍 |
| SAD | Safety Analysis Diagram | 安全分析图 |
| SAD | Safety Assessment Document | 安全评估文件 |
| SAD | Single Administrative Document | 单一管理文件 |
| SAD | Safety Assurance Diagram | 安全保证图 |
| SAD | Southern African AIDS Trust | 南部非洲艾滋病信托基金 |
| SAD | Supply And Demand | 供应和需求 |
| SAD | Site Adaption Data (FAA ARTCC configuration of site resources) | 现场适应性数据（FAA ARTCC现场资源配置） |
| SAD | Stock Assessment Driven (fisheries) | 种群评估驱动（渔业） |
| SAD | Special Assignment Division | 特殊任务部 |
| SAD | system application design | 系统应用设计 |
| SAD | Safety Analysis Document | 安全分析文件 |
| SAD | Social Anxiety Disorder | 社交焦虑症 |
| SAD | Search and Destroy | 搜索和销毁 |
| SAD | Staging Area Director | 暂存区控制器 |
| SAD | Special Asset Department | 特殊资产部 |
| SAD | Subacromial Decompression | 肩峰下减压 |
| SAD | Sons and Daughters (band) | 儿子和女儿（乐队） |
| SAD | System Architecture Document | 系统架构文件 |
| SAD | Station Arrival Date | 车站到达日期 |
| SAD | Stand and Deliver | 站立并交付 |
| SAD | Seizure-Alert Dog | 癫痫警犬 |
| SAD | SlovenskÁ AutobusovÁ Doprava | SlovenskÁ AutobusovÁ Doprava |
| SAD | Seek and Destroy | 寻找和摧毁 |
| SAD | Scan Axis Directionality | 扫描轴方向性 |
| SAD | Systems Architectural Directorate | 系统架构委员会 |
| SAD | Stanford Athletic Department (Stanford University) | 斯坦福大学体育系 |
| SAD | Status Advisory Display | 状态咨询显示 |
| SAD | Structured ASCI Design | 结构化ASCI设计 |
| SAD | Self-Aware Data | 自我感知数据 |
| SAD | Service Application Description | 服务应用程序描述 |
| SAD | Supplementary Alteration Drawing | 补充变更图 |
| SAD | Small Angle Diffraction | 小角度衍射 |
| SAD | Software Architecture Description | 软件体系结构描述 |
| SAD | Standard Auto Discount (insurance) | 标准汽车折扣（保险） |
| SAD | Special Activities Directorate | 特别活动局 |
| SAD | Singles Awareness Day | 单身意识日 |
| SAD | source-to-axis distance | 源到轴的距离 |
| SAD | Scientifically Aided Design | 科学辅助设计 |
| SAD | suppressor-activation determinant | 抑制激活决定簇 |
| SAD | secondary affective disorder | 继发性情感障碍 |
| SAD | Strategic Accelerator Design | 战略加速器设计 |
| SAD | sugar,acetone,diacetic acid(test) | 糖、丙酮、二乙酸（试验） |
| SAD | Suppen Ale Doon | 晚餐Ale Doon |
| SAD | sinoaortic denervation | 去窦主动脉神经 |
| SAD | Students Affairs Department | 学生事务部 |
| SAD | Smart Ack Dropper | 智能确认丢弃器 |
| SAD | surgical abscess drainage | 外科脓肿引流 |
| SAD | succinic acid dehydrogenase | 琥珀酸脱氢酶 |
| SAD | Stress, Anxiety, and Depression | 压力、焦虑和抑郁 |
| SAD | sinoatrial disease | 窦房结病 |
| SAD | Sandawe | 桑达韦人 |
| SAD | Simple Anxiety Defect | 单纯焦虑缺陷 |
| SAD | small airway dysfunction | 小气道功能障碍 |
| SAD | Separation Anxiety Disorder | 分离焦虑症 |
| SAD | Schizoaffective Disorder | 分裂情感障碍 |
| SAD | Speech Activity Detector | 语音活动检测器 |
| SAD | Stand Alone Dump | 独立转储 |
| SAD | Selected Area Diffraction | 选定区域衍射 |
| SAD | School of Architecture and Design | 建筑与设计学院 |
| SAD | Static Airbag Deployment | 静态安全气囊展开 |
| SAD | Security Association Data | 安全关联数据 |
| SAD | Single, Available, and Desperate | 单一、可用和绝望 |
| SAD | Situation Awareness Display | 态势感知显示 |
| SAD | Single Awareness Day (slang for Valentine's Day) | 单一的意识(俚语,情人节) |
| SAD | Standard American Diet | 标准美国饮食 |
| SAD | Sistema de AdquisiciÓn de Datos (Spanish: Data Acquisition Systems) | Sistema de AdquisiciÓn de Datos (Spanish: Data Acquisition Systems) |
| SAD | Sociedad AnÓnima Deportiva | Sociedad AnÓnima Deportiva |
| SAD | Sum of Absolute Differences | 绝对差值之和 |
| SAD | System Allocation Document | 系统分配文件 |
| SAD | Students Against Destruction | 学生反对破坏 |
| SAD | System Activity Display (IBM) | 系统活动显示（IBM） |
| SAD | Submarine Anomaly Detection | 海底异常探测 |
| SAD | Solution Architecture Document | 解决方案体系结构文档 |
| SAD | Symptomatic Abdominal Distension | 症状性腹部扩张 |
| SAD | Serial Analog Delay | 串行模拟延迟 |
| SAD | Solar Array Drive | 太阳能阵列驱动器 |
| SAD | South Atlantic Division (USACE) | 南大西洋分部（USACE） |
| SAD | Security Association Database (computer security, information assurance) | 安全关联数据库（计算机安全、信息保障） |
| SAD | Station Address Directory | 站点地址目录 |
| SAD | Source Axis Distance | 源轴距离 |
| SAD | Senior Air Director | 高级航空总监 |
| SAD | Sorry About Dresden (band) | 对不起，关于德累斯顿（乐队） |
| SAD | Shiromani Akali Dal (India) | Shiromani Akali Dal（印度） |
| SAD | System Analyst Designer | 系统分析设计师 |
| SAD | Seniors Against Discrimination | 老年人反对歧视 |
| SAD | State Active Duty (National Guard) | 国家现役（国民警卫队） |
| SAD | Safety & Arming Device | 安全与武装的装置 |
| SAD | Splitter-And-Delivery (network architecture) | 拆分器和交付（网络架构） |
| SAD | Summary of Audit Differences | 审计差异汇总 |
| SAD | Square Air Diffuser | 方形空气扩散器 |
| SAD | System Administrator/Administration | 系统管理员或行政 |
| SAD | Stay Another Day | 再待一天 |