Langenbruck is a municipality in the district of Waldenburg in the canton of Basel-Landschaft in Switzerland. Langenbruck has an area, as of 2009, of 15.69 square kilometers (6.06 sq mi). Of this area, 8.01 km2 (3.09 sq mi) or 51.1% is used for agricultural purposes, while 6.93 km2 (2.68 sq mi) or 44.2% is forested. Of the rest of the land, 0.74 km2 (0.29 sq mi) or 4.7% is settled (buildings or roads), 0.04 km2 (9.9 acres) or 0.3% is either rivers or lakes.