IE
- i.e. – (i) id est (Latin, roughly "that is")
- ie – (s) Interlingue language (ISO 639-1 code)
- IE – (i) Indo-European languages – Internet Explorer – (s) Ireland (ISO 3166 digram) – Iced Earth
- IEA – (i) International Energy Agency
- IEC – (i) International Electrotechnical Commission
- IED – (i) Improvised Explosive Device
- IEEE – (p) Institute of Electrical and Electronics Engineers ("I triple-E")
- IELTS – (a) International English Language Testing System
- IER – (i) Information Exchange Requirement
- IET - (i) Institution of Engineering and Technology
- IET – (ii) Initial Entry Training
- IETF – (i) Internet Engineering Task Force
- IEW – (i) Intelligence and Electronic Warfare
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