IST can stand for several different things:

In relation to computing:

• Information Society Technologies
• Information Systems and Technology
• Interrupt Service Thread
• Interrupt Source Tree

In relation to medicine:

• Insulin shock therapy

In relation to politics:

• International Socialist Tendency
• International Spartacist Tendency (usually written iSt)

As the name of a time zone:

• Indian Standard Time
• Irish Summer Time
• Israeli Standard Time
• Iran Standard Time

This is a disambiguation page; that is, one that points to other pages that might otherwise have the same name. If you followed a link here, you might want to go back and fix that link to point to the appropriate specific page.