| SAI | Sugar Association, Inc. | 糖业协会。 |
| SAI | Solution Assay Instrument | 溶液分析仪器 |
| SAI | Strategic Agricultural Initiative | 战略农业倡议 |
| SAI | Supersonic Aerospace International LLC | 超音速航空航天国际有限责任公司 |
| SAI | Serving Area Interface | 服务区接口 |
| SAI | Sternberg Astronomical Institute | 斯特恩伯格天文研究所 |
| SAI | Steering Axis Inclination | 转向轴倾斜 |
| SAI | Silent Aircraft Initiative (Massachusetts Institute of Technology, Cambridge) | 静音飞机计划（麻省理工学院，剑桥） |
| SAI | single agency item (US DoD) | 单一机构项目（美国国防部） |
| SAI | Systems Architecture and Interfaces (Aeronautical Radio Incorporated) | 系统架构和接口（航空无线电公司） |
| SAI | Statement of Additional Information (SEC) | 附加信息声明（SEC） |
| SAI | Systems Applications International | 系统应用国际 |
| SAI | Sistema de Alimentacion Ininterrumpida (Spanish: uninterruptible power supply) | Ininterrumpida食品系统（西班牙语：不间断电源） |
| SAI | Swales Aerospace Inc. (Beltsville, Maryland) | Swales Aerospace Inc.（马里兰州贝尔茨维尔） |
| SAI | Self-Administered Interview | 自主面试 |
| SAI | Sua Altezza Imperiale (Italian: His/Her Imperial Highness; codices and manuscripts) | Altezza的Imperiale(意大利:他/她的皇家王子,”和手稿) |
| SAI | Square-And-Integrate | 平方和积分 |
| SAI | Smart Animal Identification (workshop) | 智能动物识别（车间） |
| SAI | Spectrum Astro Incorporated (Phoenix, Arizona) | Spectrum Astro公司（亚利桑那州凤凰城） |
| SAI | Society of Atherosclerosis Imaging | 动脉粥样硬化成像学会 |
| SAI | Service Adoration And Illumination | 服务崇拜和照明 |
| SAI | Supplemental Academic Instruction | 补充学术指导 |
| SAI | School Ability Index | 学校能力指数 |
| SAI | Security Associates, Inc. | Security Associates公司。 |
| SAI | Space Academic Institute | 空间学术研究所 |
| SAI | Single Accountable Individual | 单一责任个人 |
| SAI | Supervisory Assistance Incentive | 监督协助激励 |
| SAI | San Marino, San Marino | 圣马力诺，圣马力诺 |
| SAI | Scenic America, Inc. | 美国风景区公司。 |
| SAI | Sequence Associated Information | 序列相关信息 |
| SAI | Sailfish (FAO fish species code) | 旗鱼（粮农组织鱼类物种代码） |
| SAI | Systems Application Integration | 系统应用程序集成 |
| SAI | Security Awareness Index | 安全意识指数 |
| SAI | Senior Army Instructor | 高级陆军教官 |
| SAI | Structural Adequacy Index (pavement assessment) | 结构充分性指数（路面评估） |
| SAI | Sahawa al Iraq | 伊拉克萨哈瓦 |
| SAI | Sweet Adelines International (International Organization of Women Barbershop Singers) | Sweet Adelines International（国际女子理发店歌手组织） |
| SAI | Slowly Adapting Type I | 缓慢适应I型 |
| SAI | Strategic Command Administrative Instruction (USSTRATCOM) | 战略司令部行政指令 |
| SAI | Sports Authority of India | 印度体育管理局 |
| SAI | Standardization, Analysis, and Integration Branch | 标准化、分析和集成部门 |
| SAI | Standards Australia International Ltd. | 澳大利亚标准国际有限公司。 |
| SAI | Semi-Automatic Interface | 半自动接口 |
| SAI | Strength and Integrity Inspection (US Navy 5 year boiler inspection) | 强度和完整性检查（美国海军5年锅炉检查） |
| SAI | Supreme Audit Institution (Republic of Korea) | 最高审计机构（大韩民国） |
| SAI | Social Accountability International | 国际社会责任 |
| SAI | South American Indian (Other) | 南美印第安人（其他） |
| SAI | systemic active immunotherapy | 全身主动免疫疗法 |
| SAI | social adequacy index | 社会充分指数 |
| SAI | Surveillance-Aided Intercept | 监视辅助拦截 |
| SAI | Sequential Action Interaction | 顺序动作交互 |
| SAI | Securities America, Inc. | 美国证券公司。 |
| SAI | Service Argos Inc. | 服务Argos公司。 |
| SAI | Science Applications International Corporation (stock symbol) | 科学应用国际公司（股票代码） |
| SAI | Sigma Alpha Iota (women's music fraternity) | 西格玛α撇(女性的音乐兄弟会) |
| SAI | Spanish Artificial Intelligence | 西班牙人工智能 |
| SAI | Standby Attitude Indicator | 备用姿态指示器 |
| SAI | Specific Area of Interest | 特定关注领域 |
| SAI | Situation Awareness Infrastructure | 态势感知基础设施 |
| SAI | Simplified Ab Initio Method | 简化的Ab Initio方法 |
| SAI | South African Infantry (South African ground troops in World War I) | 南非步兵（第一次世界大战中的南非地面部队） |
| SAI | Southern Aeroparts Inc. (Tulsa, OK) | Southern Aeroparts Inc.（俄勒冈州塔尔萨市） |
| SAI | South American Indian (language) | 南美印第安人（语言） |
| SAI | Server Availability Index | 服务器可用性索引 |
| SAI | Standard Advertising Invoice | 标准广告发票 |
| SAI | Sea-to-Air Interface | 海空接口 |
| SAI | Secretariat al'Adoption Internationale | 奥萨马•本•拉登'Adoption国际秘书处 |
| SAI | Safety Appliance Illustration | 安全设备图解 |