FO
- fo – (s) Faroese language (ISO 639-1 code)
- FO – (s) Faroe Islands (ISO 3166 digram; FIPS 10-4 territory code) – (i) Force Operations (military) – Forward Observer – Frame Optional (military symbology)
- FOAD – (a) Fuck Off And Die
- FOAF – (a) Friend Of A friend
- FoB – (i) Free On Board (shipping)
- FOB – (i/a) Forward Operating Base
- FOC – (i) Full Operational Capability – First of Class
- FoE – (p) Friends of the Earth
- FOGC – (i) Federal Oil and Gas Council
- FOH – (a) Front Of House
- FOIA – (a) Freedom of Information Act
- FOM – (a) Federation Object Model
- FONSI – (a) Finding of No Significant Impact
- FOO – (a) Forward Observation Officer
- FOR – (i) Field Of Regard – Frame Of Reference
- Fortran – (p) The IBM Mathematical FORmula TRANslating System (programming language)
- FOS – (i) Florida Ornithological Society – Full Operational Status
- FoS – (i) Family of Systems
- FOSE – (p) Fallout 3 Script Extender
- FOSE – (a) Federal Office Systems Expo
- FOT – (i) Free on truck
- FOTA – (i) Fellow of the Orthodontic Technicians Association
- FOTC – Flight of the Conchords
- FOUO – (i) For Official Use Only
- FOV – (i) Field Of View
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