| IEB | Institute of Electronic Business e.V. Berlin, http://www.ieb.net |
| B2B | Business to Business [phonetischer Begriff] [engl.] Internet-Handel direkt zwischen Unternehmen |
| BBP | Business to Business Procurement [engl.] Produktname für Bestellsoftware bei Zulieferern [SAP] |
| BtoB | Business to Business [engl.] Handel zwischen Unternehmen mittels Internet |
| IOM | Institute of Medicin |
| IOP | Institute of Physics, IoP |
| IIE | Institute of Industrial Engineers |
| III | Institute for Information Industry |
| OGI | Oregon Graduate Institute |
| RIA | Robot Institute of America |
| RIT | Rochester Institute of Technology |
| IGM | Institute for Global Management |
| RMI | Rocky Mountains Institute |
| IGM | Institute for Geoscience Mainz Mainz, http://www.uni-mainz.de/FB/Geo/Geologie/index_alt.html |
| IGC | Institute for Global Communications |
| SEI | Software Engineering Institute |
| IEE | Institute of Electrical Engineers [UK] |
| ISR | Institute of Snow Research |
| IIT | Indian Institute for Technology |
| ITS | Institute for Telecommunication Sciences Washington, DC, http://www.its.bldrdoc.gov |
| IRR | Institute of Race Relations London, http://www.irr.org.uk |
| BIH | British Institute of Homeopathy |
| IRE | Institute of Radio Engineers |
| IPI | International Press Institute |
| IoPP | Institute of Physics Publishing Ltd. |
| IMA | Institute for Media Analysis, Inc. New York, [NY], http://www.covertaction.org |
| MIT | Massachusetts Institute of Technology Cambridge, http://web.mit.edu |
| MOLI | Microsoft Online Institute |
| IMA | Institute for the Musical Arts Bodega, [CA], http://www.ima.org |
| NCI | National Cancer Institute [U.S.A.] |
| NEI | Nuclear Energy Institute |
| NIH | National Institute of Health |
| NJIT | New Jersey Institute of Technology Newark, [NJ], http://www.njit.edu |
| ATI | American Tasting Institute |
| ATI | Advanced Technology Institute |
| CIT | California Institute of Technology |
| CIT | Case Institute of Technology |
| CIT | California Institute of Technology |
| EMI | European Monetary Institute |
| LBIY | Leo Baeck Institute Yearbook Zeitschrift |
| CBI | Charles Babbage Institute Minneapolis, http://www.cbi.umn.edu |
| ISI | Institute for Scientific Information |
| CSI | Computer Security Institute San Francisco, USA |
| AIE | American Institute of Engineers |
| CALTECH | California Institute of Technology |
| GR-I | Graduate, Realtors Institute |
| GVU | Georgia Institute of Technology Atlanta, [GA], http://www.gatech.edu |
| ASI | Arbeitsgemeinschaft Sozialwissenschaftlicher Institute e.V. Bonn |
| SRI | Stanford Research Institute Menlo Park, [CA], http://www.sri.com |
| AEI | American Enterprise Institute Washington, DC, http://www.aei.org |