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

Of the agricultural land, 57.82% is used for farming or pastures, while 2.8% is used for orchards or vine crops.

Of the settled areas, 3.83% is covered with buildings, 0.44% is industrial, 1.77% is classed as special developments, 0.15% is parks or greenbelts and 3.54% is transportation infrastructure.

[5] The municipality is located in the Rot river valley (Rottal).

Most of the population (as of 2000[update]) speaks German (93.8%), with Albanian being second most common ( 3.5%) and Serbo-Croatian being third ( 1.9%).

The age distribution, as of 2008[update], in Altbüron is; 238 people or 26.3% of the population is 0–19 years old.

In the 2000 census[update] the religious membership of Altbüron was; 632 (71.6%) were Roman Catholic, and 120 (13.6%) were Protestant, with an additional 16 (1.81%) that were of some other Christian faith.