Rhäzüns (German pronunciation: [rɛˈtsyns]; Romansh: Razén, pronounced [ʁɐˈtsen]) is a municipality in the Imboden Region in the Swiss canton of Grisons.

It was acquired by the House of Habsburg in 1497 but remained part of the Three Leagues for the purposes of jurisdiction.

In the Treaty of Schönbrunn (1809), the Habsburg Monarchy ceded the lordship of Rhäzüns to France.

It reverted to Habsburg after the defeat of Napoleon in 1814, but was assigned to Grisons in the Vienna Congress of 1815 (article 78).

The transition of administrative power to Grisons, as a canton of the restored Swiss Confederacy, became effective only on 19 January 1819.

Of the rest of the land, 4.2% is settled (buildings or roads) and the remainder (3.4%) is non-productive (rivers, glaciers or mountains).

[4] From the 2000 census[update], 741 or 61.7% are Roman Catholic, while 280 or 23.3% belonged to the Swiss Reformed Church.

Paul's Church are listed as Swiss heritage sites of national significance.