IN, In or in may refer to:
Arts and media Music In (album), by the Outsiders, 1967 In Nomine, a title given to any of numerous short pieces of English polyphonic instrumental or vocal music during the 16th and 17th centuries I.N (born Yang Jeong-in, 2001), South Korean singer and member of boy band Stray Kids "In", a song by Swans from the album The Great Annihilator
Other media "In", an episode of Minder Imperishable Night, the eighth official game in the Japanese Touhou series
Businesses and organizations Independent Network, a UK-based political association Indiana Northeastern Railroad (Association of American Railroads reporting mark) Indian Navy, a part of the India military Infantry, the branch of a military force that fights on foot IN Groupe, the producer of French official documents MAT Macedonian Airlines (IATA designator IN) Nam Air (IATA designator IN) Office of Intelligence and Counterintelligence, sometimes abbreviated IN
Places India (country code IN) Indiana, US (postal code IN) Ingolstadt, Germany (license plate code IN) In, Russia, a town in the Jewish Autonomous Oblast
Science and technology .in, the internet top-level domain of India Inch (in), a unit of length Indium, symbol In, a chemical element Intelligent Network, a telecommunication network standard Intra-nasal (insufflation), a method of administrating some medications and vaccines Integrase, a retroviral enzyme The "is an element of" operator ∈, denoting that an expression is an element of a set
Other uses In (Korean name), a family name and a given name Indonesian language (former ISO 639-1 language code; "id" used since November 3, 1989)
See also Inn (disambiguation) INS (disambiguation)