GNB may refer to:

  • G. N. Balasubramaniam
  • Geographical Names Board of Canada
  • Geographical Names Board of New South Wales
  • Good News Bible
  • Grenoble-Isère Airport (IATA code)
  • GNB Technologies, a North American automotive batteries company acquired by Exide in 2000
  • Goliath National Bank, a fictional bank in the American TV sitcom How I Met Your Mother
  • GNB, The fictional television network where the main characters work on the American TV Show Less Than Perfect
  • Gram Negative Bacilli