| MSAC | Most Seriously Affected Countries | 最受影响的国家 |
| MSAC | Member of Stonebridge Associated Colleges Association | 石桥联合学院协会会员 |
| MSAC | Mount San Antonio College (California) | 圣安东尼奥山学院（加利福尼亚州） |
| MSAC | Midland Seventh-Day Adventist Church (Midland, TX) | 米德兰基督复临安息日会教堂（德克萨斯州米德兰） |
| MSAC | Minimum Security Activity Checklist (US DoD IT security) | 最低安全活动清单（美国国防部IT安全） |
| MSAC | Meridian Services Attendant Console (Nortel) | Meridian服务服务员控制台（北电） |
| MSAC | Mine Safety Appliances Company (Pittsburgh, Pennsylvania) | 矿山安全设备公司（宾夕法尼亚州匹兹堡） |
| MSAC | Medical and Scientific Advisory Council | 医学和科学咨询委员会 |
| MSAC | Marine Safety Advisory Council (Canada) | 海洋安全咨询委员会（加拿大） |
| MSAC | Morris-Sussex Area Council (New Jersey Boy Scouts) | 莫里斯·萨塞克斯地区议会（新泽西童子军） |
| MSAC | Member of Stonebridge Associated Colleges | 石桥联合学院成员 |
| MSAC | Mobile Supervision and Control | 移动监控 |
| MSAC | Medical Situational Awareness and Control | 医疗情境意识和控制 |