Lom is a municipality in Oppland county, Norway. It is part of the traditional region of Gudbrandsdal. The administrative centre of the municipality is the village of Fossbergom. The municipality of Lom was established on 1 January 1838 (see formannskapsdistrikt). The area of Skjåk was separated from Lom to become a municipality of its own in 1866.
The coat-of-arms is from modern times. They were granted on 6 February 1987. The arms show three silver-colored skjeltrekor (spades) on a blue background. These spades were historically used to scoop water from the irrigation channels typical for the area. The area is one of the driest in Norway, but the soil is good for agriculture. It thus needs irrigation. In the 17th century, a system was developed in which melting water from the mountains was transported to the area using wooden channels or aqueducts. The water was further divided using irrigation channels.