FSO may refer to:
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GovernmentEdit
- Federal Protective Service (Russia) (Russian: {{#invoke:Lang|lang}}), 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
MusicEdit
- 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
TransportEdit
- Fabryka Samochodów Osobowych, a Polish automotive company
- Franklin County State Airport, in Vermont, United States
- Subiaco railway station, in Western Australia