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

Of the rest of the land, 10.7% is settled (buildings or roads) and the remainder (0.2%) is non-productive (rivers, glaciers or mountains).

Of the agricultural land, 66.16% is used for farming or pastures, while 2.86% is used for orchards or vine crops.

Of the settled areas, 4.81% is covered with buildings, 0.41% is industrial, 0.2% is parks or greenbelts and 5.32% is transportation infrastructure.

[5] The municipality is located on a line of hills on the south-west edge of the Surental.

It consists of the village of Knutwil and the settlements of St. Erhard, Eriswil, Wolen, Schaubern and Hitzligen.

In the 2000 census[update] the religious membership of Knutwil was; 1,291 (81.6%) were Roman Catholic, and 139 (8.8%) were Protestant, with an additional 17 (1.07%) that were of some other Christian faith.