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

Of the rest of the land, 10.2% is settled (buildings or roads) and the remainder (0.5%) is non-productive (rivers, glaciers or mountains).

Of the agricultural land, 49.96% is used for farming or pastures, while 2.7% is used for orchards or vine crops.

Of the settled areas, 5.19% is covered with buildings, 0.78% is industrial, 0.59% is classed as special developments, 0.37% is parks or greenbelts and 3.26% is transportation infrastructure.

Most of the population (as of 2000[update]) speaks German (86.9%), with Albanian being second most common ( 5.3%) and Italian being third ( 2.5%).

The age distribution, as of 2008[update], in Reiden is; 1,491 people or 23.5% of the population is 0–19 years old.

In the 2000 census[update] the religious membership of Reiden was; 3,880 (65.1%) were Roman Catholic, and 999 (16.8%) were Protestant, with an additional 106 (1.78%) that were of some other Christian faith.