IED

Devices

• Improvised explosive device, an explosive device often used in unconventional warfare
• Instantaneous electrical detonator, used to trigger an explosive device
• Intelligent electronic device, in the electric power industry

Dictionaries

• Indogermanisches etymologisches Wörterbuch (Indo-European Etymological Dictionary), by Julius Pokorny
• Interlingua–English Dictionary, the first major presentation of Interlingua to the public

Insurance

• Industry Exposure Database, estimating the total insured exposure to a peril in a region

Law

• Infliction of Emotional Distress, a tort cause of action, falling under intentional torts
• Industrial Emissions Directive, a European Union directive

Medicine

• Inter-ictal Epileptiform Discharge, a characteristic of epileptic seizures
• Intermittent explosive disorder, a mental health disorder
• Intestinal epithelial dysplasia, another name for congenital tufting enteropathy

Organizations

• Information Engineering Directorate, now the Information Technology Directorate of the United Kingdom government Department of Trade and Industry
• Institute of Economic Development, the professional body for economic development practitioners
• Institute for Educational Development, at the Aga Khan University
• Institution of Engineering Designers, a UK Engineering Council ECUK registered professional society
• International Endowment for Democracy, a U.S. non-profit organization
• Istituto Europeo di Design, the European Institute of Design