MPA
- 3-Mercaptopropionic acid
- 4-Nonanoylmorpholine
- Katima Mulilo Airport
- MPA submachine gun
- MPA – the Association of Magazine Media
- MPAS (disambiguation)
- Macedonian Press Agency
- Maine Principals' Association
- Manipur People's Army
- Marine protected area
- Mario Party Advance
- Maritime and Port Authority of Singapore
- Maritime patrol aircraft
- Marriage Protection Act
- Maryland and Pennsylvania Railroad
- Massachusetts Port Authority
- Master of Performing Arts
- Master of Professional Accountancy
- Master of Public Administration
- Master of Public Affairs
- Mauritius Ports Authority
- Max Planck Institute for Astrophysics
- Medical Products Agency (Sweden)
- Medroxyprogesterone acetate
- MeerKAT
- Megapascal
- Member of the Provincial Assembly
- Mesa Preparatory Academy
- Methiopropamine
- Methylphosphonic acid
- Metropolitan Police Authority
- Microscopic polyangiitis
- Mid Pacific Airlines
- Mineral Products Association
- Minor physical anomalies
- Mooroopna railway station
- Morgan Park Academy
- Motion Picture Association
- Mounds Park Academy
- Mount Pisgah Academy
- Mount Pleasant Airport, Falkland Islands
- Movement for the Autonomies
- Movement pattern analysis
- Music Publishers Association
- Music Publishers Association (UK)
- Myanma Port Authority
- Mycophenolic acid
- Personal Care Products Council
- Port of Baltimore