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
This disambiguation page lists articles associated with the title FSO.If an internal link led you here, you may wish to change the link to point directly to the intended article. Category: