| Acronym | Definition |
|---|
| MBSA | Microsoft Baseline Security Analyzer |
| MBSA | Majlis Bandaraya Shah Alam (Malaysia) |
| MBSA | Modular Building Systems Association |
| MBSA | Master Builders South Africa |
| MBSA | Multicultural Business Student Association |
| MBSA | Manual Business Systems Association |
| MBSA | Medical Board of South Australia |
| MBSA | Minority Business Students Association |
| MBSA | Michigan Bean Shippers Association |
| MBSA | Mokena Baseball Softball Association (Illinois) |
| MBSA | Muslim Business Student Association |
| MBSA | mBedded System Agent |
| MBSA | Master of Business Student Association |
| MBSA | Merchant Broking Services Australia Pty Ltd |
| MBSA | Massachusetts Bay Sailing Association |
| MBSA | Main Bus Switching Assembly |
| MBSA | Meal Break Standby Allowance (obsolete) |
| MBSA | Munitions Board Standards Agency |
| MBSA | Model Based Scene Analysis |
| MBSA | Meredith Bay Sailing Association (Meredith, NH) |