In politics and government[edit]
In military, intelligence, and security[edit]
National Intelligence Service (Greece), Greece's national intelligence agency
National Intelligence Service (South Korea), South Korea's state security agency
Naval Investigative Service, the predecessor of the Naval Criminal Investigative Service (NCIS) agency of the U.S. Navy
Norwegian Intelligence Service, Norway's military intelligence agency
National Intelligence Service (South Africa)
Other uses in politics and government[edit]
New Israeli Shekel, the currency unit of modern Israel
Newly Independent States, the 15 independent states that seceded from the USSR in its dissolution in December 1991
Statistics Belgium (Dutch: Nationaal Instituut voor de Statistiek, French: Institut National de Statistique), the main government statistics office of Belgium
Nuclear Information Service, a UK-based organisation that promotes debate on nuclear disarmament
National Institute of Statistics of Cambodia, the National statistical agency of Cambodia