| MARR | Major Accident Response and Reconstruction 
| Others |
| MARR | Major Accident Response Reconstruction
| Others |
| MARR | Malaysia Automotive Remanufacturing Roadmap
| Others |
| MARR | Marginal Acceptable Real Return
| Others |
| MARR | Marginal Annual Rate of Return
| Others |
| MARR | Martian Anal Rectum Recreation
| Others |
| MARR | Merger and Acquisition Research Report
| Others |
| MARR | Message Archive Recording Retrieval
| Others |
| MARR | Metro Atlanta Recovery Residence
| Others |
| MARR | Metro Atlanta Recovery Residences
| Others |
| MARR | Mice and Rats Rights
| Others |
| MARR | Michigan Antibiotic Resistance Reduction
| Others |
| MARR | Minimum Acceptable Rate of Return
| Others |
| MARR | Minimum Attractive Rate Of Return
| Others |
| MARR | Ministry of Aboriginal Relations and Reconciliation
| Others |
| MARR | Modified Accelerated Rate of Return
| Others |
| MARR | Multiple Access Rural Radio
| Others |