| LEM | Laser Emission Microprobe | 激光发射微探针 |
| LEM | Laser Energy Meter | 激光能量测定器 |
| LEM | Laser Energy Monitor | 激光能量监控器 |
| LEM | Lunar Excursion Module | 登月舱 |
| LEM | leucocyte endogenous mediator | 白细胞内源性介体 |
| LEM | leibovitz-emory(medium) | 莱博维茨纪念馆（中等） |
| LEM | Light Emotive Machine | 轻情感机器 |
| LEM | Life Extension Mix | 寿命延长组合 |
| LEM | Lentinus Edodes Mycelia | 香菇菌丝体 |
| LEM | Louisville Energy Marketing | 路易斯维尔能源营销 |
| LEM | Light Extinction Measure | 光消光测量 |
| LEM | Light Emission Microscopy / Microscope | 光发射显微镜/显微镜 |
| LEM | Light Easy Mobile | 轻便易移动 |
| LEM | light electron microscope | 光电子显微镜 |
| LEM | lemon | 柠檬 |
| LEM | lateral eye movements | 横向眼球运动 |
| LEM | Linear Electric Motor | 线性电动机 |
| LEM | Local Effect Model | 局部效应模型 |
| LEM | Light Equipment Maintenance | 轻型设备维护 |
| LEM | Launch Escape Monitor | 启动逃生监视器 |
| LEM | Law of Excluded Middle | 排除中间法 |
| LEM | Local Equipment Manager | 本地设备经理 |
| LEM | Lateral Eye Movement (neuro-linguistic programming) | 侧向眼动（神经语言编程） |
| LEM | Location Efficient Mortgage | 位置高效抵押 |
| LEM | Language Extension Module | 语言扩展模块 |
| LEM | Laboratory for Energy and Materials (cycles) | 能源与材料实验室（循环） |
| LEM | Licenciado En Mercadotecnia (Mexico) | Licenciado En Mercadotecnia（墨西哥） |
| LEM | Lay Eucharistic Minister | 圣餐牧师 |
| LEM | Logistics Element Manager | 物流要素经理 |
| LEM | Law Enforcement Manual | 执法手册 |
| LEM | Live from Earth and Mars (educational project; also seen as LFEM) | 从地球和火星生活（教育项目；也称为LFEM） |
| LEM | Living Eck Master (cult) | 活着的埃克大师（邪教） |