IDN

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