Romoos is a municipality in the district of Entlebuch in the Canton of Lucerne in Switzerland .

Romoos has an area of 37.3 km2 (14.4 sq mi). Of this area, 34.6% is used for agricultural purposes, while 61.8% is forested. Of the rest of the land, 2.2% is settled (buildings or roads) and the remainder (1.4%) is non-productive (rivers, glaciers or mountains). In the 1997 land survey, 61.76% of the total land area was forested. Of the agricultural land, 34.3% is used for farming or pastures, while 0.29% is used for orchards or vine crops.