Mönthal is a municipality in the district of Brugg in canton of Aargau in Switzerland.

Originally it was a fortified late Bronze Age hilltop settlement.

After 1380 the rights to the church collection and the appointment of the minister was held by Brugg.

Starting in the 18th century the village had a certain prosperity through viticulture and home production of linen and cotton.

Of the rest of the land, 0.34 square kilometers (0.13 sq mi) or 8.7% is settled (buildings or roads).

44.0% of the total land area is heavily forested and 2.0% is covered with orchards or small clusters of trees.

The blazon of the municipal coat of arms is Azure three piles inverted Or topped with as many Mullets of the same in chief.

[8] The age distribution, as of 2008[update], in Mönthal is; 20 children or 4.9% of the population are between 0 and 9 years old and 55 teenagers or 13.3% are between 10 and 19.

[10] About 67.1% of the total households were owner occupied, or in other words did not pay rent (though they may have a mortgage or a rent-to-own agreement).

[8] From the 2000 census[update], 107 or 26.9% were Roman Catholic, while 204 or 51.3% belonged to the Swiss Reformed Church.