Alberswil is a municipality in the district of Willisau in the canton of Lucerne in Switzerland.

Of the agricultural land, 70.95% is used for farming or pastures, while 2.79% is used for orchards or vine crops.

Of the settled areas, 3.35% is covered with buildings, 0.56% is industrial, 0.56% is classed as special developments, and 3.35% is transportation infrastructure.

It consists of the linear village of Alberswil, the hamlet of Burgrain and Schloss (castle) Kasteln.

Most of the population (as of 2000[update]) speaks German (91.4%), with Albanian being second most common ( 4.6%) and Turkish being third ( 1.9%).

The age distribution, as of 2008[update], in Alberswil is; 159 people or 27.8% of the population is 0–19 years old.

In the 2000 census[update] the religious membership of Alberswil was; 413 (79.%) were Roman Catholic, and 49 (9.4%) were Protestant, with an additional 8 (1.53%) that were of some other Christian faith.