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

Of the rest of the land, 12.6% is settled (buildings or roads) and the remainder (0.7%) is non-productive (rivers, glaciers or mountains).

Of the agricultural land, 71.25% is used for farming or pastures, while 6.49% is used for orchards or vine crops.

Of the settled areas, 8.33% is covered with buildings, 0.19% is industrial, 0.58% is classed as special developments, 0.77% is parks or greenbelts and 2.71% is transportation infrastructure.

[6] The municipality is located on the southern shore of Lake Sempach (Sempachersee).

It consists of the village of Nottwil and the scattered settlements of Eggerswil, Ei, Gattwil, Huprächtigen, Tann and Studen as well as Schloss Tannenfels.

Most of the population (as of 2000[update]) speaks German (92.8%), with Italian being second most common ( 1.5%) and Albanian being third ( 1.3%).

In the 2000 census[update] the religious membership of Nottwil was; 2,049 (76.4%) were Roman Catholic, and 309 (11.5%) were Protestant, with an additional 36 (1.34%) that were of some other Christian faith.