NSIS

• National Sheep Identification System, the implementation in Ireland for the identification and registration of ovine and caprine animals
• Network Store Interface Service, a Microsoft Windows service
• Next Steps in Signaling, a former Internet Engineering Task Force working group
• Nullsoft Scriptable Install System, a script-driven Windows installation system
• Nova Scotian Institute of Science, a membership organization promoting science in Nova Scotia

• National Strategy for Information Sharing, part of Nationwide Suspicious Activity Reporting Initiative
• National Security Intelligence Section, of Ireland's Directorate of Military Intelligence
• Nova Scotian Institute of Science Nova Scotian Institute of Science

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