| SIA | Software Industry Association | 软件工业协会 |
| SIA | Southern iota-Aquarids | 南宝瓶座ι流星雨 |
| SIA | Singapore International Airlines (ICAO code) | 新加坡国际航空公司(ICAO代码) |
| SIA | Spaceweek International Association | 太空周国际协会 |
| SIA | Scaffold Industry Association | 脚手架行业协会 |
| SIA | Swiss Insurance Association | 瑞士保险协会 |
| SIA | Shareware Industry Association | 共享软件行业协会 |
| SIA | Security Industry Association | 安全行业协会 |
| SIA | Satellite Industry Association | 卫星工业协会 |
| SIA | Students' Internet Association | 学生的互联网协会 |
| SIA | Society of Insurance Accountants | 保险会计师协会 |
| SIA | Student Internet Association | 学生互联网协会 |
| SIA | Securities Industry Association (merged into Securities Industry & Financial Markets Association) | 证券行业协会(融入证券行业协会和金融市场的) |
| SIA | Solvents Industry Association (London, UK) | 溶剂行业协会(英国伦敦) |
| SIA | Safety Institute of Australia | 澳大利亚安全协会 |
| SIA | Securities Industry Association | 证券业协会 |
| SIA | SociÉtÉ Suisse des IngÉnieurs et des Architectes | SociÉtÉ Suisse des IngÉnieurs et des Architectes |
| SIA | Service in Information & Analysis Limited (London, UK) | 在信息和分析服务有限公司(英国伦敦) |
| SIA | Social Impact Assessment | 社会影响评估 |
| SIA | SocietÀ Italiana di Arboricoltura | SocietÀ Italiana di Arboricoltura |
| SIA | State Implementing Agency (India) | 国家执行机构(印度) |
| SIA | System Interface Agreement | 系统接口协议 |
| SIA | Schweizerischer Ingenieur- und Architektenverein | 建筑工程师 |
| SIA | SocietÀ Italiana di Artroscopia | SocietÀ Italiana di Artroscopia |
| SIA | Societa Italiana di Andrologia (Italian) | Societa Italiana di Andrologia(意大利语) |
| SIA | Strategic Integral Approach | 战略综合方法 |
| SIA | Sociedad Argentina de Inmunologia | 阿根廷国际社会 |
| SIA | Strategic Internet Alliance | 战略互联网联盟 |
| SIA | Scalable Interconnect Architecture | 可扩展互连架构 |
| SIA | Sentral Sykehuset I Akershus | 中央Sykehuset I Akershus |
| SIA | Starfleet Intelligence Agency (Star Trek) | 星际舰队情报局(星际迷航) |
| SIA | Sistema de InformaciÓn Aduanero (Spanish: Customs Information System) | Sistema de InformaciÓn Aduanero (Spanish: Customs Information System) |
| SIA | Singapore International Airport | 新加坡国际机场 |
| SIA | Standard Instrument Approach | 标准仪器方法 |
| SIA | Sequential Injection Analysis | 顺序注射分析 |
| SIA | Staffing Industry Analysts, Inc. (Los Altos, California) | 人员配备行业分析师公司(加利福尼亚州洛斯阿尔托斯) |
| SIA | Standardized IDRS/CFOL Access | 标准化的IDRS /编辑存取 |
| SIA | Swap-In Arrears | 交换欠费 |
| SIA | SOCO International Plc (UK) | SOCO国际有限公司(英国) |
| SIA | Student Initiated Assignment | 学生发起的作业 |
| SIA | Security Integration Architecture | 安全集成体系结构 |
| SIA | Sam I Am (band) | 山姆我是(乐队) |
| SIA | Screen Imagination Agency | 屏幕想象机构 |
| SIA | Services Internetworking Architecture (Sedona) | 服务互联网架构(Sedona) |
| SIA | Specialized Individual Assistance | 专业个人援助 |
| SIA | Soroptimists International of the Americas | 美洲职业妇女福利互助会国际 |
| SIA | Storage Instantaneous Audimeter | 存储瞬时音量计 |
| SIA | Serial Interface Adaptor | 串行接口适配器 |
| SIA | sperm-immobilizing antibody | 精子固定抗体 |
| SIA | spin immunoassay | 自旋免疫测定 |
| SIA | Special Instructional Assistance | 专门教学帮助 |
| SIA | Secretariat For Industrial Assistance | 工业援助秘书处 |
| SIA | Shadow Investigation Agency | 影子调查局 |
| SIA | Samurai In Action | 武士在行动 |
| SIA | Securities Industry Act | 证券业法 |
| SIA | Signal Apparel, Inc. | Signal Apparel公司。 |
| SIA | Superman's Insurance Agency | 超人的保险机构 |
| SIA | Solidaridad Internacional Antifascista | Solidaridad国际抗腹水药 |
| SIA | Xi An, Mainland China | 中国大陆Xi |
| SIA | Spectrophotometric Intracutaneous Analysis | 分光光度皮内分析 |
| SIA | Scanner Interface Assembly | 扫描仪接口组件 |
| SIA | Startegic Issues Analysis | Startegic问题分析 |
| SIA | Session Initiation Application | 会话启动应用程序 |
| SIA | Ski Industries America | 美国滑雪产业 |
| SIA | Syrian Investment Agency | 叙利亚投资机构 |
| SIA | Socially Intelligent Agent | 社交智能代理 |
| SIA | Special Interface Adapter | 专用接口适配器 |
| SIA | Sistema de Informação Aduaneiro (Portuguese: Customs Information System) | Sistema de Informação Aduaneiro (Portuguese: Customs Information System) |
| SIA | Salary Increase Authorization | 加薪授权 |
| SIA | Stuck in Active (Refers to DUAL-3-SIA error message of EIGRP) | 卡在激活位置(参考EIGRP的DUAL-3-SIA错误消息) |
| SIA | Society for Industrial Archeology | 工业考古学会 |
| SIA | Survivors of Incest Anonymous | 乱伦匿名者的幸存者 |
| SIA | Station Interface Adapter | 站接口适配器 |
| SIA | Students in Action | 学生在行动 |
| SIA | Structured Improvement Activity | 结构化改进活动 |
| SIA | Syra Intergalactic Arms (gaming) | 西拉银河间武器(游戏) |
| SIA | Shareware Industry Awards | 共享软件行业奖 |
| SIA | Swiss Industrial Abrasive | 瑞士工业磨料 |
| SIA | System Interface Assembly | 系统接口组件 |
| SIA | Sorry in Advance | 提前道歉 |
| SIA | Statistical Implicative Analysis | 统计含义分析 |
| SIA | Stable Implementation Agreements (Bellcore) | 稳定实施协议(Bellcore) |
| SIA | subacute infectious arthritis | 亚急性感染性关节炎 |
| SIA | synalbumin-insulin antagonism | 突触蛋白胰岛素拮抗作用 |
| SIA | Signal Indicated Alarm | 信号指示报警 |
| SIA | Self Initiated Activity | 自行发起的活动 |
| SIA | small irregular activity | 小不规则活动 |
| SIA | Sugar Industry Authority (Jamaica) | 糖业管理局(牙买加) |
| SIA | syncytia induction assay | 合胞体诱导试验 |
| SIA | Sorry I Asked (chat) | 抱歉我问了(聊天) |
| SIA | stimulation-induced anesthesia | 刺激诱导麻醉 |
| SIA | serum inhibitory activity | 血清抑制活性 |
| SIA | stress-induced anesthesia | 应激性麻醉 |