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NNL may refer to:

  • National Natural Landmark - a natural history conservation program of the U.S. Secretary of the Interior
  • National Nuclear Laboratory - the UK's government-owned commercially operated fully customer-funded nuclear technology service provider
  • Negro National League (1920–1931) - one of the several Negro Leagues which were established during the period in the United States in which organized baseball was segregated
  • Negro National League (1933–1948) - established two years after the first Negro National League had disbanded