| Acronym | Definition |
|---|
| MCSA | Microsoft Certified Systems Administrator |
| MCSA | Microsoft Certified Solutions Associate (certification) |
| MCSA | Mobile Computing Systems and Applications (various organizations) |
| MCSA | Multi Channel Sales Associate (various companies) |
| MCSA | Motor Carrier Safety Administration (US DOT) |
| MCSA | Mountain Club of South Africa |
| MCSA | Methodist Church of Southern Africa |
| MCSA | Motor Current Signature Analysis |
| MCSA | Muscle Cross-Sectional Area |
| MCSA | Major County Sheriff's Association |
| MCSA | Missouri Council of School Administrators |
| MCSA | Mir Cooperative Solar Array (joint US/Russian project) |
| MCSA | Multi-Channel Spectrum Analyzer |
| MCSA | Motor Carrier Safety Act of 1984 |
| MCSA | Morris Campus Student Association |
| MCSA | Moscow, Camden, and San Augustine Railroad |
| MCSA | Marble Collectors' Society of America |
| MCSA | Mathematical and Computational Sciences Awareness workshop |
| MCSA | Marine Corps Supply Activity |
| MCSA | Midwest Collegiate Snowsports Association |
| MCSA | Minnesota Chinese Student Association |
| MCSA | McMaster University Chinese Students' Association (Ontario, Canada) |
| MCSA | Midwest Collegiate Sailing Association, Inc. |
| MCSA | Marion County Staffing Association |
| MCSA | Maneuver Control System Applications |
| MCSA | Modified Carry-Select Adder |