| Acronym | Definition |
|---|
| GCO | Grand Contournement Ouest (French: Great Western Bypass) |
| GCO | Global Customer Operations |
| GCO | GeorgiaCarry.org (firearms website) |
| GCO | Grounded Convenience Outlet (electrical outlet) |
| GCO | Groupes Coopérateurs en Oncologie (French oncology group) |
| GCO | Global Compact Office (UN) |
| GCO | Generator Certification Official (waste) |
| GCO | Government Communication Office (various locations) |
| GCO | Georgia Carpet Outlet |
| GCO | Global Children's Organization (Los Angeles, CA) |
| GCO | Grand Cube Osaka (Osaka, Japan) |
| GCO | Grassroots Community Organization |
| GCO | Google Check Out |
| GCO | Global Clinical Operations |
| GCO | Ground Communication Outlet (aviation) |
| GCO | Green College Online |
| GCO | Got Cut Off |
| GCO | Geotechnical Control Office (Hong Kong) |
| GCO | Global Concept Owner |
| GCO | General Cash Offer (investments) |
| GCO | Government Concept of Operations |
| GCO | Grand Commander |
| GCO | Golf Course Operator/Owner |
| GCO | Group Compliance Officer (job title) |
| GCO | Gun Control Officer |
| GCO | Garbage Collection Overhead |
| GCO | Greeley Chamber Orchestra (Greeley, CO) |
| GCO | Government Contracting Office |
| GCO | Game Cards Online |