Wenceslaus IV, also known as Wenceslaus of Luxembourg, was King of Bohemia from 1378 until his death and King of Germany from 1376 until he was deposed in 1400. As he belonged to the House of Luxembourg, he was also Duke of Luxembourg from 1383 to 1388.

The House of Luxembourg or Luxembourg dynasty was a royal family of the Holy Roman Empire in the Late Middle Ages, whose members between 1308 and 1437 ruled as kings of Germany and Holy Roman emperors as well as kings of Bohemia, Hungary and Croatia. Their rule was twice interrupted by the rival House of Wittelsbach. The family takes its name from its ancestral county of Luxembourg which they continued to hold.