Riedern is a former municipality in the Canton of Glarus in Switzerland . Effective from 1 January 2011, Riedern is part of the municipality of Glarus.

Riedern is first mentioned in 1350 as Riedern.

Riedern has an area, as of 2006, of 1.5 km2 (0.58 sq mi). Of this area, 23.8% is used for agricultural purposes, while 53.6% is forested. Of the rest of the land, 13.2% is settled (buildings or roads) and the remainder (9.3%) is non-productive (rivers, glaciers or mountains).