Marbach is a former municipality in the district of Entlebuch in the canton of Lucerne in Switzerland.

Of the rest of the land, 2.6% is settled (buildings or roads) and the remainder (4.7%) is non-productive (rivers, glaciers or mountains).

Of the agricultural land, 45.11% is used for farming or pastures, while 0.18% is used for orchards or vine crops.

Of the settled areas, 1.04% is covered with buildings, 0.07% is industrial, 0.29% is classed as special developments, 0.07% is parks or greenbelts and 1.11% is transportation infrastructure.

Most of the population (as of 2000[update]) speaks German (97.8%), with Portuguese being second most common (0.6%) and Serbo-Croatian being third (0.4%).

In the 2000 census[update] the religious membership of Marbach was; 859 (73.1%) were Roman Catholic, and 238 (20.3%) were Protestant, with an additional 1 (0.09%) that were of some other Christian faith.

The wettest month is June during which time Marbach receives an average of 218 mm (8.6 in) of precipitation.

The driest month of the year is February with an average of 112 mm (4.4 in) of precipitation over 16.4 days.