GNR may be:

• Great Northern Railways:
  • Great Northern Railway of Great Britain.
  • Great Northern Railway of Ireland. (usually GNR(I))
  • Great Northern Railway of the United States.
• GNR a Portuguese band.
• Guardia Nazionale Repubblicana of Italian Social Republic. Replaced the MVSN.
• Guarda Nacional Republicana of Portugal - rural gendarmerie
• Guns N' Roses, a musical group in the United States.