| MLL | Mannerheimin Lastensuojeluliitto (Finnish) | Mannerheimin Lastensuojeluliitto（芬兰语） |
| MLL | Mixed Lineage Leukemia | 混合血统白血病 |
| MLL | Maximum Lobe Length | 最大瓣长度 |
| MLL | Major League Lacrosse (professional outdoor lacrosse) | 职业户外长曲棍球 |
| MLL | Millbrook Press, Inc. (former stock symbol; now MILB) | Millbrook Press，Inc.（前股票代码；现为MILB） |
| MLL | Maersk Lines, Limited | 马士基航运有限公司 |
| MLL | Majority-Logic-Like | 多数逻辑类 |
| MLL | Modify lot location | 修改批次位置 |
| MLL | myeloid/lymphoid leukemia | 淋巴性白血病或骨髓 |
| MLL | Money Losing Lacrosse | 赔钱的长曲棍球 |
| MLL | Major League Lacrosse | 大联盟长曲棍球 |
| MLL | malignant lymphoma,lymphoblastic | 恶性淋巴瘤，淋巴母细胞 |
| MLL | mixed lymphocytic lymphoma | 混合淋巴细胞淋巴瘤 |
| MLL | Modern Languages and Literatures | 现代语言与文学 |
| MLL | Multilayer Laue Lens | 多层劳厄透镜 |
| MLL | Department of Modern Languages and Literatures | 现代语言文学系 |
| MLL | Marshall, Alaska USA | 美国阿拉斯加马歇尔 |
| MLL | Major Lacrosse League | 大长曲棍球联盟 |