| Acronym | Definition |
|---|
| DDN | Dayton Daily News (Ohio newspaper) |
| DDN | Date de Naissance (French: Date of Birth) |
| DDN | Dotted Decimal Notation |
| DDN | Defense Data Network (US DoD; Digital Computer System) |
| DDN | Design Diffusion News (magazine) |
| DDN | Dos Device Name |
| DDN | Directory Distinguished Network Name |
| DDN | Defense Data Network |
| DDN | Direct Dial Network |
| DDN | Dynamic Decision Network |
| DDN | Digital Data Network |
| DDN | DataDirect Networks (Chatsworth, CA) |
| DDN | Devis Directeur National (French: National Master Specification; Canada) |
| DDN | Digital Divide Network |
| DDN | Directiva de Defensa Nacional (Spanish: National Defense Policy) |
| DDN | Discado Directo Nacional (Spanish: national direct dial) |
| DDN | Domain Distribution Network |
| DDN | Démolition Déménagement Nettoyage (French: Demolition Moving Cleaning) |
| DDN | Dogues du Net (French sports fan club) |
| DDN | Design Develop Now (digital solutions) |
| DDN | Donjon de Naheulbeuk (French website) |
| DDN | Defense Digital Network |
| DDN | Design Decision Notice |
| DDN | Descent Developer Network |
| DDN | Dance Dot Net (website) |
| DDN | Destructeurs de Noob (French gaming clan) |