The Landsraad was a fictional organisation in the Dune universe created by Frank Herbert. The Landsraad is the assembly of all the nobles in the Imperium. The word Landsraad means literally the council (raad or raed or rede (see Great Vowel Shift), from Middle English) of the lands (or of the landowning nobility in a feudal system). However, it is unknown whether the term landsraad as such was ever used outside the Dune universe (See below). Herbert may have invented it for his novels.

While the other noble houses including House Atreides and House Harkonnen do not individually approach the power of the Emperor and are in competition for fiefdoms, financial and political power, and Imperial favor, their collective representation in an assembly known as the Landsraad provides a check and balance against the power of House Corrino and the Emperor.

Landsraad or Landsråd is a modern Danish word, meaning regional council. Indeed the word raad, or similar words, exist in most modern Germanic languages (raad in Dutch and Afrikaans, råd in Danish, Norwegian and Swedish and rat in German) and almost universally means some sort of governing council. The Dutch and Afrikaans versions would be Landraad and the German one Landesrat.