FCO

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, one of various names for a management-level position responsible for supervising the quality of accounting and financial reporting of an organization, also known as a comptroller
 * 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
 * Final Certificate of Occupancy