| Acronym | Definition |
|---|
| MEO | Medium-Earth Orbit |
| MEO | Medical Education Online |
| MEO | Marine Engineer Officer |
| MEO | My Eyes Only (software) |
| MEO | Middle Earth Orbit |
| MEO | Military Equal Opportunity |
| MEO | Most Efficient Organization |
| MEO | Marketing Executive Officer (various companies) |
| MEO | Meteoroid Environment Office (US NASA) |
| MEO | Mediated Electrochemical Oxidation |
| MEO | Middle Earth Online (game) |
| MEO | Marine Enforcement Officer |
| MEO | Middle East Operations (corporate position) |
| MEO | Major Engine Overhaul |
| MEO | My Expert Opinion |
| MEO | Middle Ear Obliteration |
| MEO | Multiple Equipment Order |
| MEO | Mars Environmental Observer |
| MEO | Middle East Observatory (Montreal, Canada) |
| MEO | Marine Engineering Operations |
| MEO | Montreal Earth Observatory (Canada) |
| MEO | Maintenance Engineering Order |
| MEO | Maximum Eye Opening |
| MEO | Maintenance Engineering Operations (AMSEC) |
| MEO | Mass in Earth Orbit |
| MEO | Mental Exchange Organization |
| MEO | Medium Elliptical Orbit |
| MEO | Marine Emergency Organisation |
| MEO | Major Equipment Operator |
| MEO | Motive Equipment Operator |
| MEO | Manned Earth Orbit |
| MEO | Momentary Engine Overspeed |
| MEO | Mechanical Equipment Operator |
| MEO | Manned Extra-vehicular Operation |