Haut-Rhin (French pronunciation: [oʁɛ̃] ⓘ)[3] is a département in the Grand Est region, France, bordering both Germany and Switzerland.

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.

Haut-Rhin is one of the original 83 départements, created during the French Revolution, on 4 March 1790 through the application of the law of 22 December 1789 in respect of the southern half of the province of Alsace (Haute-Alsace).

Many Haut-Rhinois work in Switzerland, especially in the chemical industries of Basel, but commute from France where living costs are lower.

With the return of Alsace-Lorraine to France by the Treaty of Versailles in 1919, Paris accepted that Alsace and Moselle should retain some local laws in respect of certain matters, especially with regard to hunting, economic life, local government relationships, health insurance and social rights.