| MSIA | Mapping Sciences Institute Australia 
| Others |
| MSIA | Marin Schools Insurance Authority
| Others |
| MSIA | Master of Science in Industrial Administration
| Others |
| MSIA | Master of Science in Information Assurance
| Others |
| MSIA | Medical Sciences Interdepartmental Area
| Others |
| MSIA | Medical Software Industry Association
| Others |
| MSIA | Metadata Standards For Information Assurance
| Others |
| MSIA | Michigan Self Insurers' Association
| Others |
| MSIA | Michigan Snowsports Industries Association
| Others |
| MSIA | Microsoft Software Inventory Analyzer
| Others |
| MSIA | Microsoft Software Inventur Assistent
| Others |
| MSIA | Minnesota Self Insurers Association
| Others |
| MSIA | Minnesota Storm Intercept Association
| Others |
| MSIA | Missouri Seed Improvement Association
| Others |
| MSIA | Missouri Self Insurers Association
| Others |
| MSIA | Mobile Suit In Action
| Others |
| MSIA | Mobile Suite In Action
| Others |
| MSIA | Mobile Suits In Action
| Others |
| MSIA | Mona Shores Intelligence Agency
| Others |
| MSIA | Movement of Spiritual Inner Awareness
| Others |
| MSIA | Multispectral Image Analyzer
| Others |