FSO may refer to:
Government
- Federal Protective Service (Russia) (Russian: Federalnaya Sluzhba Okhrany), responsible for the security of Russian state officials
 - Federal Statistical Office (Switzerland)
 - Financial Secretary's Office, of the Government of Hong Kong
 - Foreign Service Officer, of the United States Foreign Service
 - Forest Section Officer, in India
 
Music
- Fairfax Symphony Orchestra, in Virginia, United States
 - Frankston Symphony Orchestra, in Victoria, Australia
 - Fulham Symphony Orchestra, in London
 - "F.S.O.", the first single from the Regurgitator album Tu-Plang
 - Film Symphony Orchestra, Czech classical orchestra
 
Transport
- Fabryka Samochodów Osobowych, a Polish automotive company
 - Franklin County State Airport, in Vermont, United States
 - Subiaco railway station, in Western Australia
 
Other uses
- Fire Support Officer
 - Flash shared object
 - Floating storage and offloading
 - Free-space optical communication
 - Flag Service Organization
 
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