| Acronym | Definition |
|---|
| MTRA | Monster Truck Racing Association |
| MTRA | Money Transmitter Regulators Association |
| MTRA | Medical Technical Research Associates (San Bruno, CA) |
| MTRA | Medizinisch Technische Radiologie Assistentinnen |
| MTRA | Michigan Therapeutic Recreation Association |
| MTRA | Minnesota Trail Riders Association |
| MTRA | Marion Therapeutic Riding Association, Inc. |
| MTRA | Midwest Trail Riders Association |
| MTRA | Motorcycle Trail Riding Association |
| MTRA | Model Thoroughbred Racing Association |
| MTRA | Military Temporary Reserved Airspace |
| MTRA | Manitoba Therapeutic Recreation Association (Canada) |
| MTRA | Multiple Tenancies Rentable Area |