IED
- Detonator
- Improvised explosive device
- Indo-European Etymological Dictionary
- Indogermanisches etymologisches Wörterbuch
- Industrial Emissions Directive
- Information Engineering Directorate
- Institute for Educational Development
- Institute of Economic Development
- Institution of Engineering Designers
- Intelligent electronic device
- Interlingua–English Dictionary
- Intermittent explosive disorder
- Istituto Europeo di Design
- NASU Institute of Electrodynamics