| Acronym | Definition |
|---|
| FMO | For Members Only |
| FMO | Forced Migration Online (website) |
| FMO | Fédération des Maladies Orphelines (French: Federation of Orphan Diseases) |
| FMO | Flavin-Containing Monooxygenase |
| FMO | Fire Marshal's Office |
| FMO | Financierings-Maatschappij voor Ontwikkelingslanden (Dutch: Netherlands Development Finance Company) |
| FMO | Fire Management Officer (National Park Service) |
| FMO | Facilities Management Office |
| FMO | Financial Management Office(r) |
| FMO | Frontier Molecular Orbital |
| FMO | Flexible Macroblock Ordering (polycom video coding) |
| FMO | Field Marketing Organization (insurance) |
| FMO | Federation of Manufacturing Opticians (UK) |
| FMO | Fluorescence Minus One (flow cytometry) |
| FMO | Fast Moving Object (asteroids) |
| FMO | Furnishings Management Office |
| FMO | Future Mode of Operation |
| FMO | Fish Marketing Organization (Hong Kong) |
| FMO | Frequency Management Office |
| FMO | Muenster, Germany - Muenster (Airport Code) |
| FMO | Forms Management Officer |
| FMO | Federation of Manufactured Home Owners of Florida, Inc. |
| FMO | Future Method of Operation |
| FMO | Fleet Mail Office (Canada Post) |
| FMO | Flight Medical Officer |
| FMO | Fumed Metal Oxides (engineering) |
| FMO | Fire Motor Operator |
| FMO | Freak Me Out |
| FMO | Full Member Organization |
| FMO | Field Maintenance Office |
| FMO | Flatland Meteorological Observatory |
| FMO | Flight Management Office |
| FMO | Fleet Maintenance Officer (Navy) |
| FMO | Force Modernization Officer (US Army) |
| FMO | Facilities Management Operations (various locations) |
| FMO | Fodor Máriusz Orchestra (electronic band; Budapest, Hungary) |