MDN
MDN is an abbreviation for:
- Mark of the German Central Bank , see Mark (GDR)
- Message Disposition Notification , an acknowledgment of receipt for e-mails sent by the recipient
- Movimentu Dezenvolvimentu Nasional , an East Timorese party alliance
- Mozilla Developer Network , developer and documentation site of the Mozilla Foundation
- Main-Donau Netzgesellschaft , see N-ERGIE #MDN Main-Donau Netzgesellschaft mbH