Nin

Nin or NIN may refer to:


 * National identification number, a system used by governments around the world to keep track of their citizens
 * National Information Network
 * National Institute of Nutrition, Hyderabad, an institution in Hyderabad, India
 * Netherlands Institute for Neuroscience, a neuroscience research institute in Amsterdam, the Netherlands
 * Nine Inch Nails, an American industrial rock band founded by Trent Reznor
 * NIN (magazine), a Serbian political magazine
 * NIN (cuneiform), the Sumerian sign for lady
 * NIN (gene), a human gene
 * Nin (surname), a surname
 * Nion or Nin, a letter in the Ogham alphabet
 * Akira Nishitani (a.k.a. Nin or Nin-Nin), co-creator of the game Street Fighter II
 * Anaïs Nin, French-Cuban author
 * Nin, Croatia, a town in the Zadar County in Croatia
 * Bishop Gregory of Nin, an important figure in the 10th century ecclesiastical politics of Dalmatia.