Werthenstein is a municipality in the district of Entlebuch in the canton of Lucerne in Switzerland.

Of the rest of the land, 6.9% is settled (buildings or roads) and the remainder (1.1%) is non-productive (rivers, glaciers or mountains).

Of the agricultural land, 56.28% is used for farming or pastures, while 3.31% is used for orchards or vine crops.

Of the settled areas, 2.93% is covered with buildings, 1.08% is industrial, 0.38% is classed as special developments, 0.25% is parks or greenbelts and 2.29% is transportation infrastructure.

Most of the population (as of 2000[update]) speaks German (96.4%), with Italian being second most common ( 0.7%) and Albanian being third ( 0.6%).

In the 2000 census[update] the religious membership of Werthenstein was; 1,590 (84.%) were Roman Catholic, and 127 (6.7%) were Protestant, with an additional 33 (1.74%) that were of some other Christian faith.