Haut-Rhin is a department in the Grand Est region of 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 (Lower Rhine). Especially after the 1871 cession of the southern territory known since 1922 as Territoire de Belfort, although it is still densely populated compared to the rest of metropolitan France.

On 1 January 2021, the departments of Bas-Rhin and Haut-Rhin have been merged into the European Collectivity of Alsace.