Hölstein is a municipality in the district of Waldenburg in the canton of Basel-Country in Switzerland. Hölstein is first mentioned around 1101-03 as Hulestein. Hölstein has an area, as of 2009, of 6.03 square kilometers. Of this area, 2.61 km² or 43.3% is used for agricultural purposes, while 2.4 km² or 39.8% is forested. Of the rest of the land, 0.89 km² or 14.8% is settled, 0.05 km² or 0.8% is either rivers or lakes and 0.01 km² or 0.2% is unproductive land.