Ist
- -ism
- Adobe ImageStyler
- Hokkaido University
- IS Tighennif
- IST Entertainment
- Inappropriate sinus tachycardia
- Indian Standard Time
- Information Science
- Information and Software Technology
- Institute for Simulation and Training
- Institute of Science and Technology, Austria
- Institute of Science and Technology, Bangladesh
- Institute of Science and Technology, West Bengal
- Institute of Space Technology
- Instituto Superior Técnico
- InterSwitch Trunk
- Internal set theory
- International School Tripoli
- International School of Tanganyika
- International School of Toulouse
- International Socialist Tendency
- International Spartacist Tendency
- Interrupt Stack Table
- Interstellar Technologies
- Inverse scattering transform
- Irish Standard Time
- Israel Standard Time
- Ist (island)
- Istanbul Airport
- Istriot
- NBA In-Season Tournament
- Penn State College of Information Sciences and Technology
- Society for Imaging Science and Technology
- Stanford University
- Toyota ist
- University of Tokyo