SNI may refer to:
Science and technology
- Substitution nucleophilic internal, a chemistry reaction mechanism
- Swedish Standard Industrial Classification, a Swedish economic classification system
- Server Name Indication, an extension to the TLS computer networking protocol
Companies
- Scripps Networks Interactive, a media company
- Showtime Networks Inc., an American cable network company
- Siemens Nixdorf Informationssysteme, a former computer hardware company
- Société Nationale d'Investissement, a Moroccan conglomerate
- Sports Network Incorporated, a former American media company
Organizations
- National Information Service (Brazil), or Serviço Nacional de Informações, the former name of the Brazilian Intelligence Agency
- Shelter Now International, a Christian foreign aid organization, based in Germany and historically focused on Pakistan and Afghanistan
- Sistema Nacional de Investigadores, a Mexican government agency
- Soviet Naval Infantry
- Swiss Nanoscience Institute
Other uses
- Standar Nasional Indonesia (Indonesian National Standard), formulated by the National Standardization Agency
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