GNR may be:

• Guns N' Roses, a heavy rock band in the United States.

• Railways:
  • Great Northern Railway of Great Britain.
  • Great Northern Railway of Ireland. (usually GNR(I))
  • Great Northern Railway of the United States.
  • Georgia Northeastern Railroad, in the U.S. state of Georgia
• Guardia Nazionale Repubblicana of Italian Social Republic (1943-45). Replaced the MVSN and the Carabinieri military police corps.
• GNR a Portuguese band.
• Guarda Nacional Republicana of Portugal - rural gendarmerie
• In bioethics, GNR denotes the technologies of genetics, nanotechnology, and robotics.
• The Global Name Registry, the operator of the .name top-level domain.

GNR