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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