IN
- In – (s) Indium
- IN – (s) India (FIPS 10-4 country code; ISO 3166 digram) – Indiana (postal symbol) – Infantry
- ina – (s) Interlingua language (ISO 639-2 code)
- INA – (p) Immigration and Nationality Act
- INAS – (a) International Near-Earth Asteroid Survey
- INC – (i) Iglesia ni Cristo (Filipino, "Church of Christ") – Indian National Congress – International Network of Crackers – Iraqi National Congress
- INCITS – (p) InterNational Committee for Information Technology Standards
- ind – (s) Indonesian language (ISO 639-2 code)
- IND – (s) India (ISO 3166 trigram)
- inet – (a) the Internet
- INDIGO – (p) (U.S.) INtelligence DIvision Gaming Operation
- INFORMS – (a) (U.S.) Institute for Operations Research and the Management Sciences
- INFOSEC – (p) Information Security
- INLA – (i) Irish National Liberation Army
- INMARSAT – (p) International Maritime Satellite organization
- INR – (s) Indian rupee (ISO 4217 currency code)
- INRI – (a/i) Iesus Nazarenus Rex Iudæorum (Latin, "Jesus of Nazareth, King of the Jews")
- INRIA – (p) Institut national de recherche en informatique et en automatique
- INS – (i) Immigration and Naturalization Service
- InSAR – (p) Interferometric synthetic aperture radar
- INST – (p) Information Standards and Technology
- in trans. – (p) in transitu (Latin, "in transit")
- INTSUM – (p) Intelligence Summary
- INTERFET – (p) International Force for East Timor
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