It or IT may refer to:
* It (pronoun)
Computing and technology
* Information technology
* Institute of technology
* .it, an Internet top-level domain
* IT (file format), an audio file format used by Impulse Tracker
Science
* Isomeric transition decay mode for atomic nucleus
Literature
* It (novel), a novel by Stephen King
* It (Christensen book), a book of poetry by Inger Christensen
* "It!" (short story), a short story by Theodore Sturgeon
* It, a book by British model and presenter Alexa Chung
* It! The Living Colossus, a comic book character
* IT, a character in A Wrinkle In Time
* ...