Flerden (Romansh: Flearda) is a municipality in the Viamala Region in the Swiss canton of the Grisons.
Flerden is first mentioned in 1156 as Flirden.
Flerden has an area, , of . Of this area, 54.6% is used for agricultural purposes, while 30% is forested. Of the rest of the land, 3.6% is settled (buildings or roads) and the remainder (11.7%) is non-productive (rivers, glaciers or mountains).
Before 2017, the municipality was located in the Thusis sub-district, of the Hinterrhein district, after 2017 it was part of the Viamala Region. It consists of the haufendorf (an irregular, unplanned and quite closely packed village, built around a central square) of Flerden on the inner Heinzenberg at an elevation of .
Flerden has a population (as of ) of . , 2.0% of the population was made up of foreign nationals. Over the last 10 years the population has grown at a rate of 15.3%.
, the gender distribution of the population was 49.5% male and 50.5% female. The age distribution, , in Flerden is; 14 people or 8.8% of the population are between 0 and 9 years old. 22 people or 13.8% are 10 to 14, and 13 people or 8.1% are 15 to 19. Of the adult population, 9 people or 5.6% of the population are between 20 and 29 years old. 17 people or 10.6% are 30 to 39, 30 people or 18.8% are 40 to 49, and 21 people or 13.1% are 50 to 59. The senior population distribution is 12 people or 7.5% of the population are between 60 and 69 years old, 16 people or 10.0% are 70 to 79, there are 6 people or 3.8% who are 80 to 89.
In the 2007 federal election the most popular party was the SVP which received 47.6% of the vote. The next three most popular parties were the FDP (24.4%), the SPS (14%) and the CVP (12.7%).
The entire Swiss population is generally well educated. In Flerden about 81% of the population (between age 25-64) have completed either non-mandatory upper secondary education or additional higher education (either university or a Fachhochschule).
Flerden has an unemployment rate of 0.32%. , there were 42 people employed in the primary economic sector and about 16 businesses involved in this sector. 3 people are employed in the secondary sector and there are 2 businesses in this sector. 15 people are employed in the tertiary sector, with 4 businesses in this sector.
The historical population is given in the following table:
Most of the population () speaks German (95.6%), with Romansh being second most common ( 3.8%) and Italian being third ( 0.6%).