| KEI | Korea Economic Institute | 韩国经济研究所 |
| KEI | KodÁly Educators of Iowa | KodÁly Educators of Iowa |
| KEI | Koadic's Endless Intellect (Everquest) | Koadic没完没了的智力(“无尽的任务”) |
| KEI | Keyword Effectiveness Index (search engine optimization) | 关键词有效性指数（搜索引擎优化） |
| KEI | Kinetic Energy Interceptor (MDA program) | 动能拦截器（MDA计划） |
| KEI | Kulan Engineering Institution (Somalia) | 库兰工程学院（索马里） |
| KEI | Kinetic Energy Interactive | 动能交互 |
| KEI | Keithley Instruments, Inc. | Keithley Instruments公司。 |
| KEI | Kepi, Indonesia | 印度尼西亚凯皮 |
| KEI | Keyword Efficiency Index | 关键词效率指数 |
| KEI | Karadeniz Ekonomik Is Birligi | Karadeniz Ekonomik是Birligi |