NSI or nsi may refer to:
Organizations
Government and politics
- National Savings and Investments, United Kingdom
- National Security Intelligence, Bangladesh
- National Statistical Institute (Bulgaria)
- Nationwide Suspicious Activity Reporting Initiative, an American law enforcement program
- New Slovenia, a Slovenian political party
- North-South Institute, a Canadian think tank
Scientific bodies
- The National Science Institute, an American educational organization
- National Space Institute, an American advocacy group
- Neurological Society of India, an Indian body for neuroscientists
- The Neurosciences Institute, United States
Other businesses and organizations
- National Screen Institute, a non-profit organization in Canada
- National Security Inspectorate, home security trade organisation in the UK
- Network Solutions, LLC., formerly Network Solutions Inc., a technology company founded in 1979
- Northern Sydney Institute of TAFE, an Australian vocational training provider
- NSÍ Runavík, a Faroe Islands football team
Places
- North Sentinel Island, Andaman Islands, India
- Naval Outlying Landing Field San Nicolas Island, a military airfield in California, US (FAA LID:<code>NSI</code>)
- Yaoundé Nsimalen International Airport (IATA:<code>NSI</code>)
Science and technology
- NASA Standard Initiator, an electrochemical device which plays a critical role in initiating various pyrotechnic events in the National Space Transportation System
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- Norwegian Scientific Index, a bibliographic database aimed at covering and rating all serious academic publication channels worldwide
- .nsi, a text file extension used by Nullsoft Scriptable Install System
Other uses
- National Student Index, a system to identify New Zealand students
- National systems of innovation
See also
- NS1 (disambiguation)
- NSL (disambiguation)