| Acronym | Sense | Language | Topics |
|---|---|---|---|
| FCO | Foreign and Commonwealth Office | In English | → International relations → Central administration |
| FCO | Field Change Order | In English | |
| FCO | Final Checkout | In English | |
| FCO | Flight Crew Operations | In English | → Aeronautics, aircraft → Astronautics |
| FCO | Functional Checkout | In English | |
| FCO | Fièvre Catarrhale Ovine | In French | → Veterinary medicine |
| FCO | Foreign & Commonwealth Office | In English | → Public administration, government |