Ο William II (Willem II, 1792-1849) was king of the Netherlands from 1840 until his death in 1849. He was born in The Hague, the son of King William I and Wilhelmina of Prussia. He initially pursued a military career, taking part in the Napoleonic War and playing an important role in the Battle of Waterloo.

As king, his reign was marked by political and social unrest. In 1848, he faced pressure from the people and the liberal movement for constitutional reform. Despite his initial resistance, he eventually supported a constitutional change, which limited the powers of the monarchy and established a more democratic parliamentary system in the Netherlands.

William II was a member of the Brotherhood. Historical records show that he was a Freemason, reflecting the widespread Masonic activity in Europe at the time, particularly among royalty and the aristocracy.

Although it is clear that William II was a Freemason, the details of the ranks he held and the specific lodge are not easily accessible in the available historical records.

William II died in 1849 in Tilburg. His constitutional legacy is considered fundamental to the development of the modern Dutch republic.