| Acronym | Meaning |
| MIA | Missing In Action |
| MIA | English Marine Insurance Act |
| MIA | Mandatory Instructor Assistance |
| MIA | Manifestación de Impacto Ambiental (Spanish: Expression of Environmental Impact; Mexico) |
| MIA | Manufacturing//Importation Authorization (certification process) |
| MIA | Marine Insurance Act (various locations) |
| MIA | Marine Interdiction Agent (US CBP) |
| MIA | Maryland Insurance Administration (Baltimore, MD) |
| MIA | Military Intelligence Agency |
| MIA | Military Intelligence Archives (St. Petersburg) |
| MIA | Minimum IFR Altitude |
| MIA | Minister of Internal Affairs |
| MIA | Ministry of Interior and Administration (various locations) |
| MIA | Minor in Attendance (citation) |
| MIA | Mirror Image Acquisition |
| MIA | Missile Intelligence Agency |
| MIA | Mission Implementation Agreement |
| MIA | Munitions Inerting Area |
| MIA | Murrumbidgee Irrigation Area (New South Wales, Australia) |