Other
- Feature-oriented scanning
- Freedom of speech
- Fabric OS, Brocade Fibre Channel operating system (computing)
- Future Office System as used by the Crown Office and Procurator Fiscal Service and developed by Anite
- Financial Ombudsman Service—Financial Ombudsman Service in the United Kingdom
- Financial Ombudsman Service (Australia)—Financial Ombudsman Service in Australia
- FOS Open Scouting—Federatie voor Open Scoutisme België
- French onion soup
- Goodwood Festival of Speed
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