| SEI | Software Engineering Institude | 软件工程协会 |
| SEI | Stock Exchange Interface | 证券交易所界面 |
| SEI | South East Indiana | 印第安纳州东南部 |
| SEI | Structural Engineering Institute (ASCE) | 结构工程学会（ASCE） |
| SEI | Supplementary Enhancement Information (digital TV) | 补充增强信息（数字电视） |
| SEI | Software Engineering Institute | 软件工程研究所 |
| SEI | Space Exploration Initiative | 空间探索倡议 |
| SEI | Sales Excellence Institute (University of Houston) | 卓越销售研究所（休斯顿大学） |
| SEI | Scheie Eye Institute (University of Pennsylvania) | Scheie Eye研究所（宾夕法尼亚大学） |
| SEI | Safety Equipment Institute | 安全设备研究所 |
| SEI | Sociedad Española de Implantes (Spanish) | Sociedad Española de Implantes (Spanish) |
| SEI | Survey of Emotional Intelligence | 情绪智力调查 |
| SEI | Seebeck Effect Imaging | 塞贝克效应成像 |
| SEI | Software Engineering Institute (Carnegie Mellon) | 软件工程研究所（卡内基梅隆） |
| SEI | Science Education Institute (Philippines) | 科学教育学院（菲律宾） |
| SEI | Stockholm Environment Institute | 斯德哥尔摩环境研究所 |
| SEI | Space Engineering Institute | 空间工程研究所 |
| SEI | Sustainable Energy Institute | 可持续能源研究所 |
| SEI | Solar Energy International | 太阳能国际 |
| SEI | Systems and Electronics Inc. | 系统和电子公司。 |
| SEI | System Engineer and Integrator | 系统工程师和集成商 |
| SEI | subendocardial infarction | 心内膜下梗塞 |
| SEI | Sistemas y InstrumentaciÓn | Sistemas y InstrumentaciÓn |
| SEI | Smithgall Enterprises Inc | Smithgall Enterprises Inc公司 |
| SEI | Simple Inference Engine | 简单推理引擎 |
| SEI | Sports Entertainment Incorporated | 体育娱乐公司 |
| SEI | Specific Energy Input | 比能量输入 |
| SEI | Servicio Extincion De Incendios | Servicio Extincion De Incentios公司 |
| SEI | Senhor Do Bonfim, Buenos Aires, Brazil | Senhor Do Bonfim，布宜诺斯艾利斯，巴西 |
| SEI | Southeastern International Corporation | 东南国际公司 |
| SEI | The Seeing Eye, Inc. | The Seeing Eye公司。 |
| SEI | Special Expiration Index | 特殊过期索引 |
| SEI | Seitel, Inc. | Seitel公司。 |
| SEI | Sykes Enterprise Incorporated | 赛克斯企业公司 |
| SEI | Socio Economic Index | 社会经济指数 |
| SEI | Sheltered English Instruction | 隐蔽式英语教学 |
| SEI | Supplemental Enhancement Information | 补充增强信息 |
| SEI | Special Experience Identifier | 特殊体验标识符 |
| SEI | Sony Electronics Inc. | 索尼电子公司。 |
| SEI | Secondary Electron Imaging | 二次电子成像 |
| SEI | Sensitive Ecosystem Inventory (Canada) | 敏感生态系统清单（加拿大） |
| SEI | Socio-Economic Index | 社会经济指数 |
| SEI | Specific Emitter Identification | 特定发射器识别 |
| SEI | Sindacato Edilizia e Industria | Sindacato Edilizia e Industria公司 |
| SEI | Self Esteem Inventory (psychology) | 自尊量表（心理学） |
| SEI | Support Equipment Installation | 支持设备安装 |
| SEI | Support Equipment Illustration | 支持设备图解 |
| SEI | Special Emphasis Item | 特殊强调项 |
| SEI | 7-Eleven, Inc | 7-Eleven公司 |
| SEI | Set Interupt Status (6502/6510 assembly language) | 设置状态(6502/6510汇编语言上) |
| SEI | Symposium on Electrical Insulation | 电绝缘研讨会 |
| SEI | Services Environmental, Inc. (Phoenixville, Pennsylvania) | Services Environmental，Inc.（宾夕法尼亚州菲尼克斯维尔） |
| SEI | SINOPEC Engineering Incorporation | 中石化工程公司 |
| SEI | Sumitomo Electric Industries, Ltd (Japan) | 住友电气工业株式会社（日本） |
| SEI | Systems Engineering & Integration | 系统工程及整合 |
| SEI | Sammons Enterprises Inc. (Dallas, TX) | Sammons Enterprises Inc.（德克萨斯州达拉斯） |