Filzbach is a former municipality in the canton of Glarus in Switzerland. Effective from 1 January 2011, Filzbach is part of the municipality of Glarus Nord.

Filzbach is first mentioned in 1394 as Vilentzspach.

Filzbach has an area, as of 2006, of 13.9 km (5.4 sq mi). Of this area, 35.4% is used for agricultural purposes, while 40.9% is forested. Of the rest of the land, 4.6% is settled (buildings or roads) and the remainder (19.1%) is non-productive (rivers, glaciers or mountains).

The municipality is located on a terrace of the Kerenzerberg mountain above the Walensee. Talalpsee and Spaneggsee are located above the lake.

Filzbach had a population (as of 2010) of 509. As of 2007, 10.2% of the population was made up of foreign nationals. Over the last 10 years the population has decreased at a rate of -6.7%. Most of the population (as of 2000) speaks German (92.6%), with Portuguese being second most common ( 1.3%) and Serbo-Croatian being third ( 1.3%).

In the 2007 federal election the most popular party was the SVP which received 50.9% of the vote. Most of the rest of the votes went to the SPS with 42.5% of the vote.

In Filzbach about 66.5% of the population (between age 25-64) have completed either non-mandatory upper secondary education or additional higher education (either University or a Fachhochschule).

Filzbach has an unemployment rate of 0.43%. As of 2005, there were 33 people employed in the primary economic sector and about 15 businesses involved in this sector. 2 people are employed in the secondary sector and there are 2 businesses in this sector. 190 people are employed in the tertiary sector, with 21 businesses in this sector.

The historical population is given in the following table:

year	population
1888	418
1900	407
1950	393
2000	542

• Filzbach in German, French and Italian in the online Historical Dictionary of Switzerland.