FCO may mean:
- Buenos Aires Western Railway (Spanish: Ferrocarril Oeste de Buenos Aires)
- Club Ferro Carril Oeste, an Argentine football club
- Farm Cove Observatory, in New Zealand
- Federal Cartel Office, in Germany
- Fellow of the College of Organists
- Financial control officer
- Foreign and Commonwealth Office, the United Kingdom's Ministry of Foreign Affairs
- Fort Collins, Colorado, United States
- Leonardo da Vinci–Fiumicino Airport, near Rome, Italy
disambiguation page lists articles associated with the title FCO.
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