IDN can refer to:
- Internationalized domain names
- Institut Industriel du Nord, the former name of École Centrale de Lille
- Indonesia, the ISO 3-letter country code
- International Data Number, in the context of an X.121 address
- Identity driven networking
- Integrated data network, the digital data network developed by Reuters and dedicated to financial markets
- Integrated Delivery Network, a network of healthcare organizations, see IDS
- Intradermal nevus, a type of skin mole
See also
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