Langenbruck is a municipality in the district of Waldenburg in the canton of Basel-Landschaft in Switzerland.
Langenbruck is first mentioned in 1145 as Langebruccho.
Langenbruck has an area, , of . Of this area, or 51.1% is used for agricultural purposes, while or 44.2% is forested. Of the rest of the land, or 4.7% is settled (buildings or roads), or 0.3% is either rivers or lakes.
Of the built up area, housing and buildings made up 2.2% and transportation infrastructure made up 2.1%. Out of the forested land, 41.8% of the total land area is heavily forested and 2.4% is covered with orchards or small clusters of trees. Of the agricultural land, 0.9% is used for growing crops and 32.4% is pastures and 17.1% is used for alpine pastures. All the water in the municipality is flowing water.
The municipality is located in the Waldenburg district, on the south side of the Oberen Hauenstein. It consists of the linear village of Langenbruck, the hamlet of Bärenwil and numerous individual farm houses.
The blazon of the municipal coat of arms is Gules, over a base Sable, on a Bridge Or a Paschal Lamb passant holding a banner Argent, a cross Gules.
Langenbruck has a population () of . , 14.8% of the population are resident foreign nationals. Over the last 10 years (1997–2007) the population has changed at a rate of 1.6%.
Most of the population () speaks German (843 or 90.7%), with Serbo-Croatian being second most common (16 or 1.7%) and Italian language being third (15 or 1.6%). There are 8 people who speak French and 1 person who speaks Romansh.
the gender distribution of the population was 51.4% male and 48.6% female. The population was made up of 832 Swiss citizens (83.5% of the population), and 165 non-Swiss residents (16.5%) Of the population in the municipality 283 or about 30.5% were born in Langenbruck and lived there in 2000. There were 139 or 15.0% who were born in the same canton, while 305 or 32.8% were born somewhere else in Switzerland, and 168 or 18.1% were born outside of Switzerland.