| Acronym | Definition |
|---|
| JCO | Journal of Clinical Oncology |
| JCO | Junior Commissioned Officer (India) |
| JCO | Java Connector (SAP) |
| JCO | Juvenile Correctional Officer |
| JCO | Joyce Carol Oates |
| JCO | Journal of Clinical Orthodontics |
| JCO | Journal of Combinatorial Optimization |
| JCO | Juvenile Court Officer |
| JCO | Journal on Control and Optimization |
| JCO | JavaCommunity.Org |
| JCO | Joint Certification Office |
| JCO | Justification for Continued Operation |
| JCO | Just Cause Oakland |
| JCO | Job Change Order (work order) |
| JCO | J-Body Club of Ontario |
| JCO | Jim Carrey Online |
| JCO | Jamaican Caves Organization |
| JCO | Joint Commission Observer |
| JCO | Joyello e la sua Cheesy Orchestra |
| JCO | Jet City Orange |
| JCO | Joint Cockpit Office |
| JCO | Joint Cockpit Office (US DoD) |
| JCO | John C. Otto Company, Inc. |
| JCO | Java CORBA Object (Oracle) |
| JCO | James Creek Outfitters |
| JCO | Judo-Club Obernburg (Germany) |
| JCO | Japanese Commissioners' Office |
| JCO | Japan Nuclear Fuels Conversion Company |
| JCO | Joy Community Outreach |
| JCO | Johnson County Office (Iowa) |
| JCO | Joint Construction Office |
| JCO | Judo Club Osny (French martial arts school; Osny, France) |
| JCO | Jamey Cicalese Online |
| JCO | Johnson County Orthopedics and Sports Medicine, PA |