NISS may refer to:
National Intelligence and Security Service, an Ethiopian government agency which gathers information and is tasked with preserving national interest.
National Institute of Statistical Sciences, an American institute that researches statistical science and quantitative analysis
the National Intelligence and Security Service, the former intelligence service of Sudan, renamed/reorganised in 2019 as the General Intelligence Service (Sudan)
Nexus International School Singapore
Nordic Institute of Stage and Studio
Charles Niss (1861–1938), American politician and businessman
Thorvald Niss (1842–1905), Danish painter
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