| Acronym | Definition |
|---|
| SDN | Sun Developer Network (Sun Microsystems) |
| SDN | SAP Developer Network |
| SDN | SOF (Special Operations Forces) Deployable Node |
| SDN | Sociale Databank Nederland (Dutch) |
| SDN | Société Des Nations |
| SDN | Student Doctor Network |
| SDN | Solution Dyed Nylon (fibers) |
| SDN | Software Distribution Network |
| SDN | Sedan |
| SDN | Service Dialing Numbers |
| SDN | Self Defending Network |
| SDN | System Development Network |
| SDN | Sun Developer Network |
| SDN | Sandane, Norway (Airport Code) |
| SDN | Software Defined Network |
| SDN | Secure Data Network |
| SDN | Specially Designated National |
| SDN | Service Delivery Network |
| SDN | Self-Defending Network |
| SDN | Sundhedsdatanettet (Danish: Health Data Network) |
| SDN | Switched Data Network |
| SDN | Standard Document Number |
| SDN | Shareware Distribution Network |
| SDN | Structural DNA Nanotechnology |
| SDN | Social Development Network (Ministry of Community Development, Youth and Sports; Singapore) |
| SDN | Sudan Republic |
| SDN | S4C Digital Networks (television) |
| SDN | Switched Digital Network |
| SDN | System Development Notification |
| SDN | Schedule Deletion Notification |
| SDN | Sprint Dial Network |
| SDN | Spatial Data Network(ing) (geographic information systems and remote sensing) |
| SDN | System Defined Network |
| SDN | Station/Subscriber Directory Number |