| ORD | Chicago O'Hare International Airport 
| Others |
| ORD | Chicago O'Hare International Airport, Chicago, Illinois. USA.
| Others |
| ORD | National Institutes of Health Office of Rare Diseases
| Others |
| ORD | O' Hare International Airport, Chicago, Illinois USA (formerly called Orchard Field)
| Others |
| ORD | Object Relational Database
| Others |
| ORD | Object Replication and Design
| Others |
| ORD | Object Replication Design
| Others |
| ORD | Observer Rating of Drowsiness
| Others |
| ORD | Off Road Design
| Others |
| ORD | Off Road Detection
| Others |
| ORD | Off Road Diesel
| Others |
| ORD | Off Road Driving
| Others |
| ORD | Off Road Dynamics
| Others |
| ORD | Office of Rare Diseases
| Others |
| ORD | Office of Research and Demonstrations
| Others |
| ORD | Office of Research and Development
| Others |
| ORD | Office of Research Development
| Others |
| ORD | Old Retarded Dogs
| Others |
| ORD | Oldtimerclub Retro Drivers
| Others |
| ORD | Omax Routed Data
| Others |
| ORD | Only Real Dogs
| Others |
| ORD | Open Rec Decisions
| Others |
| ORD | Open Reminder database
| Others |
| ORD | Open Research Data
| Others |
| ORD | Open Road Driver
| Others |
| ORD | Operation Ready Date
| Others |
| ORD | Operational Readiness Date
| Others |
| ORD | Operational Readiness Demonstration
| Others |
| ORD | Operational Ready Data
| Others |
| ORD | Operational Ready Date
| Others |
| ORD | Operational Requirements Document
| Others |
| ORD | Operational Risk Database
| Others |
| ORD | Operationally Ready Date
| Others |
| ORD | Optical Receive Data
| Others |
| ORD | Optical Rotatory Dispersion
| Others |
| ORD | Oral Radiation Death
| Others |
| ORD | Orbit Resource Descriptor
| Others |
| ORD | Orbital Requirements Document
| Others |
| ORD | Order Register Deliver
| Others |
| ORD | Ordinance Regional Depot
| Others |
| ORD | Ordinaryus
| Others |
| ORD | Ordnance
| Others |
| ORD | Override
| Others |
| ORD | Overseas Replacement Depot
| Others |