MRA
- Madison-Ridgeland Academy
- Magnetic resonance angiography
- Maharashtra Rationalist Association
- Mail retrieval agent
- Market reduction approach
- Marketing Research Association
- Mauritius Revenue Authority
- Members' Representational Allowance
- Men's Rights Activist
- Metal Roofing Alliance
- Metropolitan Redevelopment Authority
- Microcredit Regulatory Authority
- Mineralocorticoid receptor antagonist
- Minimum reception altitude
- Monland Restoration Army
- Monoamine releasing agent
- Moral Re-Armament
- Motorcycle Roadracing Association
- Mountain rescue in the United States
- Mugi Rekso Abadi
- Multiresolution analysis
- Mutual recognition agreement
- Myanmar Restaurant Association
- Northern Mariana Islands
- Registration acts (comics)
- Royal Museum of the Armed Forces and Military History