English abbreviations from iesna to ietp
- IESNA (Illuminating Engineering Society of North America)
- IESP (Institute for Education and Social Policy - NYU Steinhardt)
- IES-R (Impact of Events Scale - Revised)
- IESR (Institute for Essential Services Reform)
- IESS (Imagery Exploitation Support System)
- IEST (Institute of Environmental Sciences and Technology)
- IET (Institution of Engineering and Technology)
- IETA (International Experience and Technical Assistance)
- IETAP (International Experience and Technical Assistance Program)
- IETB (Internet Explorer ToolBar)
- IETC (Illawarra Employment and Teaching Centre)
- IETD (Interactive Electronic Technical Documentation)
- IETF (Internet Engineering Task Force)
- IETG (Human Factors and Ergonomics Society Industrial Ergonomics Technical Group)
- IETH (Institute for Effective Therapy of Homosexuality)
- IETI (Innovations in Education and Teaching International)
- IETK (Institute of Engineering and Technology, Kanpur University)
- IETL (Institut d'Etudies du Travail de Lyon)
- IETM (Interactive Electronic Technical Manual)
- IETN (Inland Empire Television Network)
- IETP (Individual Education and Training Plan)