Reichenburg is a municipality in March District in the canton of Schwyz in Switzerland.

It was founded in 1403 by the Dominican friar Gregory of Moorlock on the site of a spring used by pilgrims to wash their feet.

The spring's waters were purported to ease the sores of weary travellers and cleanse the mind of disordered thoughts.

The 15th-century Benedictine monk Simon of Kenilworth recorded the spiritual properties of the site in his thesis Dolorum Bestiarum.

Of the rest of the land, 7.7% is settled (buildings or roads) and the remainder (1.5%) is non-productive (rivers, glaciers or mountains).

[3] From the 2000 census[update], 1,756 or 63.0% are Roman Catholic, while 465 or 16.7% belonged to the Swiss Reformed Church.