IIT may refer to:
- A number of technology higher education institutes:
- Illinois Institute of Technology, a private Ph.D.-granting research university in Chicago, Illinois, USA
- Indian Institutes of Technology, a group of higher education institutes in India
- Indiana Institute of Technology, in Fort Wayne, Indiana, USA
- Informatics Institute of Technology, in Wellawatta, Sri Lanka
- IIT Madrid, (Instituto de Investigación Tecnológica), the research institute of the ICAI School of Engineering at the Comillas Pontifical University in Madrid, Spain
- International Institute of Technology, the previous name of Sirindhorn International Institute of Technology in Thailand
- Istituto Italiano di Tecnologia, in Genoa, Italy
- İzmir Institute of Technology, known primarily as "IYTE", in İzmir, Turkey
- Institute for Information Technology, a research institute of the National Research Council of Canada
- Institute of Information Technology, University of Dhaka, an Institute of University of Dhaka.
- Mindanao State University – Iligan Institute of Technology, a research university in the Philippines
- Indosat (NYSE:IIT), a telecommunications company in Indonesia
- Infantry Immersion Trainer, a mixed reality training facility prototype for small unit Infantry in Marine Corps Base Camp Pendleton, California, USA
- Integrated Information Technology, semiconductor company now named 8x8, Inc
- Intra-industry trade, the exchange of products belonging to the same industry
- Islamic Institute of Toronto, a non-profit, educational institute in Toronto, Canada