Ist or IST may refer to:
Information Science and Technology Bachelor's or master's degree in Information Science and Technology Graduate School / Faculty of Information Science and Technology, Hokkaido University, Japan Graduate School of Information Science and Technology, The University of Tokyo, Japan IST initiative of Stanford University, USA
Places Ist (island), an island in the Adriatic Sea Istanbul Airport (IATA code) Istora MRT station, a rapid transit station in Jakarta, Indonesia
Schools and organizations Institute of Science and Technology, Austria, IST Austria Institute of Science and Technology, Bangladesh, Dhaka Institute of Science and Technology, West Bengal, India Institute of Space Technology, in Islamabad, Pakistan International Socialist Tendency, grouping of Marxist organisations Instituto Superior Técnico, school of engineering, University of Lisbon, Portugal Institute for Simulation and Training, at the University of Central Florida, US International School of Tanganyika, Tanzania International School of Toulouse, a school in the south of France International Spartacist Tendency, a Trotskyist grouping International School Tripoli Penn State College of Information Sciences and Technology, Pennsylvania, USA IST Entertainment
Sports IS Tighennif, a football club based in Algeria NBA In-Season Tournament, an annual basketball tournament
Science and technology Inappropriate sinus tachycardia, an uncommon type of cardiac arrhythmia Interrupt Stack Table, an AMD64 instruction set extension InterSwitch Trunk, Avaya enhancement to Link aggregation ist, the file extension for files created by the now-obsolete Adobe ImageStyler Information and Software Technology, a journal Interstellar Technologies, a Japanese rocket manufacturer
Mathematics Internal set theory, an axiomatic basis for part of non-standard analysis Inverse scattering transform, a method for solving some non-linear partial differential equations
Time zones Indian Standard Time Irish Standard Time Israel Standard Time
Other uses Istriot, a Romance language spoken in Croatia (ISO 639-3 language code ist) Toyota ist, a subcompact car made in Japan by Toyota
See also Society for Imaging Science and Technology (IS&T), a research and education organization in the field of imaging -ism