| MLO | Milos, Greece - Milos (Airport Code) | 米洛斯，希腊-米洛斯（机场代码） |
| MLO | Major Learning Objective | 主要学习目标 |
| MLO | Major Learning Outcome | 主要学习成果 |
| MLO | Milos, Greece | 米洛斯，希腊 |
| MLO | My Line Overboard | 我的线路板外 |
| MLO | Messianic Literature Outreach | 弥赛亚文学外展 |
| MLO | Mildew-resistance LOcus gene | 抗白粉病LOcus基因 |
| MLO | Main Lug Only | 仅限主吊耳 |
| MLO | Multi-Layer Organic | 多层有机 |
| MLO | Mode-Locked Oscillator | 锁模振荡器 |
| MLO | Medical Laboratory Observer (journal) | 医学实验室观察员（期刊） |
| MLO | Monolinoleate (glycerolmonolipide used to form reversed phases) | 单油酸甘油酯（用于形成反相） |
| MLO | Medical Laboratory Observer | 医学实验室观察员 |
| MLO | Meta-Level Organization | 元级别组织 |
| MLO | Ministry of Labour/Ontario | 劳动/安大略省 |
| MLO | Material, Labor, and Overhead | 材料、劳动力和间接费用 |
| MLO | Mechanised Letter Office (UK) | 机械化信函办公室（英国） |
| MLO | Misanthropic Luciferian Order (Satanic cult) | 邪恶的卢西腓秩序（撒旦崇拜） |
| MLO | Mauna Loa Observatory | 莫纳罗亚天文台 |
| MLO | Mapua Lights Organization (Manila, Philippines) | Mapua灯光组织（菲律宾马尼拉） |
| MLO | Municipal Lighting Ordinance | 市政照明条例 |
| MLO | Mortgage Loan Officer | 抵押贷款官员 |
| MLO | Mesorhizobium Loti | 中根瘤菌洗剂 |
| MLO | mycoplasma-like organism | 支原体样生物 |
| MLO | mesiolinguo-occlusal | 近中舌咬合 |