Upper Alsace (German: Oberelsaß, French: Haute-Alsace) was the southern part of the historical region Alsace.

From 1871 to 1918, Bezirk Oberelsaß was a region (Bezirk) in the southern part of the province of Alsace–Lorraine in the German Empire.

The region corresponds exactly to the current French department of Haut-Rhin.

It was divided into the districts (Kreise) of: The flag of Oberelsaß is a yellow bar on a red field decorated on each side with three crowns.

The combination of this flag with that of Unterelsaß forms the flag of modern Alsace.