Triengen is a municipality in the district of Sursee in the canton of Lucerne in Switzerland.

Of the rest of the land, 11.6% is settled (buildings or roads) and the remainder (0.5%) is non-productive (rivers, glaciers or mountains).

Of the agricultural land, 59.06% is used for farming or pastures, while 5.57% is used for orchards or vine crops.

Of the settled areas, 5.03% is covered with buildings, 0.54% is industrial, 0.72% is classed as special developments, 0.27% is parks or greenbelts and 3.4% is transportation infrastructure.

[5] The merged municipality has an area of 22.08 km2 (8.53 sq mi)[6] Triengen has a population (as of 31 December 2020) of 4,616.

[6] Most of the population (as of 2000[update]) speaks German (85.7%), with Albanian being second most common ( 5.0%) and Portuguese being third ( 2.9%).

In the 2000 census[update] the religious membership of Triengen was; 3,035 (72.6%) were Roman Catholic, and 433 (10.4%) were Protestant, with an additional 67 (1.6%) that were of some other Christian faith.