MPA's a three letter acronym that may refer to: Transportation Maritime patrol aircraft, like Nimrod, P-3 Orion Maritime and Port Authority of Singapore Maryland and Pennsylvania Railroad Mauritius Ports Authority Mount Pleasant Airport, Falkland Islands Myanmar Port Authority Academic Degrees Master of Professional Accountancy Master of Public Administration Master of Public Affairs Chemicals Medroxyprogesterone acetate, also known by the brand name Depo-Provera Morpholide of pela… (More on Mpa)