Liedertswil (Swiss German: Tschoppehof) is a municipality in the district of Waldenburg in the canton of Basel-Country in Switzerland.
Liedertswil is first mentioned in 1194 as Liedirwilre.
Liedertswil has an area, , of . Of this area, or 37.1% is used for agricultural purposes, while or 58.2% is forested. Of the rest of the land, or 5.2% is settled (buildings or roads).
Of the built up area, housing and buildings made up 2.1% and transportation infrastructure made up 3.1%. Out of the forested land, 53.1% of the total land area is heavily forested and 5.2% is covered with orchards or small clusters of trees. Of the agricultural land, 2.1% is used for growing crops and 24.7% is pastures and 9.3% is used for alpine pastures.
The municipality is located in the Waldenburg district, at the entrance to the Waldenburger valley into the Reigoldswiler valley.
The blazon of the municipal coat of arms is Or, three Houses in pale Argent roofed Azure doored and windowed Sable.
Liedertswil has a population () of . , 2.6% of the population are resident foreign nationals. Over the last 10 years (1997–2007) the population has changed at a rate of 5.9%.
Most of the population () speaks German (148 or 98.0%) with the rest speaking French
the gender distribution of the population was 52.5% male and 47.5% female. The population was made up of 151 Swiss citizens (93.2% of the population), and 11 non-Swiss residents (6.8%) Of the population in the municipality 35 or about 23.2% were born in Liedertswil and lived there in 2000. There were 38 or 25.2% who were born in the same canton, while 60 or 39.7% were born somewhere else in Switzerland, and 8 or 5.3% were born outside of Switzerland.
In , the total Swiss population change in 2008 (from all sources, including moves across municipal borders) was an increase of 1 and the non-Swiss population decreased by 1 people. This represents a population growth rate of 0.0%.
The age distribution, , in Liedertswil is; 9 children or 5.6% of the population are between 0 and 6 years old and 23 teenagers or 14.