It or IT may refer to:

• It (pronoun)

For the file format, see Impulse Tracker.

.it is the Internet country code top-level domain (ccTLD) for Italy.

IT++ is a C++ library of classes and functions for linear algebra, numerical optimization, signal processing, communications, and statistics. It is being developed by researchers in these areas and is widely used by researchers, both in the communications industry and universities. The IT++ library originates from the former department of Information Theory at the Chalmers University of Technology, Gothenburg, Sweden.

Information technology (IT) is the application of computers and telecommunications equipment to store, retrieve, transmit and manipulate data, often in the context of a business or other enterprise.

It! may refer to:

• It! (1966 film), a 1966 horror film directed by Herbert J. Leder
• It! The Terror from Beyond Space, a 1958 science fiction film directed by Edward L. Cahn
• "It!" (short story), a story featuring the earliest plant-based swamp monster in literature