| MTSA | Minnesota Transport Services Association | 明尼苏达州运输服务协会 |
| MTSA | Medical Tourism Association of South Africa | 南非医疗旅游协会 |
| MTSA | Middle Tennessee School of Anesthesia | 田纳西州中部麻醉学院 |
| MTSA | Marine Transportation Security Act (Canada) | 《海上运输安全法》（加拿大） |
| MTSA | Middle Tennessee School of Anesthesia (Madison, TN) | 田纳西州麻醉学中学（田纳西州麦迪逊） |
| MTSA | Seaman Apprentice, Missile Technician Striker (Naval rating) | 海员学徒、导弹技术员（海军等级） |
| MTSA | Military Training Specific Allotment | 军事训练专项拨款 |
| MTSA | Multi Technical Services Arnhem (Arnhem, The Netherlands) | 多技术服务阿纳姆（荷兰阿纳姆） |