IN

IN or in may stand for:

* The ISO 3166-1 country code for India.
* Indiana (United States postal abbreviations)
* The IATA code for Macedonian Airlines
* Indium (In) symbol for the chemical element
* Intelligent network a telecommunications architecture
* Indian Navy, part of the Military of India
* Car designation for Ingolstadt
* Inch, an Imperial unit of measurement
* In Nomine
* In Records, a record label