The Imperial Territory of Alsace-Lorraine (German: Reichsland Elsaß-Lothringen or Elsass-Lothringen, French: Terre d'Empire d'Alsace-Lorraine or Alsace-Moselle) was a territory created by the German Empire in 1871, after it annexed most of Alsace and the Moselle department of Lorraine following its victory in the Franco-Prussian War. The Alsatian part lay in the Rhine Valley on the west bank of the Rhine River and east of the Vosges Mountains. The Lorraine section was in the upper Moselle valley to the north of the Vosges.
The territory was made up of 93% of Alsace and 26% of Lorraine; the remaining portions of these regions continued to be part of France. For historical reasons, specific legal dispositions are still applied in the territory in the form of a "local law". In relation to its special legal status, since its reversion to France following World War I, the territory has been referred to administratively as Alsace-Moselle.
Since 2016, the historical territory is now part of the French administrative region of Grand Est.