Haut-Rhin is a département in the Grand Est region, France, bordering both Germany and Switzerland. It is named after the river Rhine. Its name means Upper Rhine. Haut-Rhin is the smaller and less populated of the two departments of the former administrative Alsace region, the other being the Bas-Rhin. Especially after the 1871 cession of the southern territory known since 1922 as Territoire de Belfort, although it is still rather densely populated compared to the rest of metropolitan France. It had a population of 767,083 in 2021.

Alsatian is the group of Alemannic German dialects spoken in most of Alsace, a formerly disputed region in eastern France that has passed between French and German control five times since 1681.