Miliduch or Miliduh (, , ; d. 806) was an Early Slavic ruler (duke) of the Sorbs, a Polabian Slavic ancestral tribe of modern Sorbs.

Formerly allied to Charlemagne, the Sorbs ended their vassalage to the Franks and rebelled, invading Austrasia. King Charles the Younger launched a campaign against the Slavs in Bohemia in 805, and after killing Duke Lecho of the Bohemians, Charles himself crossed the Saale with his army in 806 and clashed with Polabian Slavs near modern-day Weißenfels, gaining victory, while Slavic duke Miliduch fell in the battle. The region was laid to waste, upon which the other Slavic chieftains submitted and gave hostages.Journal of the Royal Anthropological Institute of Great Britain and Ireland, Vol. 9, Royal Anthropological Institute of Great Britain and Ireland, JSTOR (Organization), 1880, p. 224J. F. Verbruggen, The art of warfare in Western Europe during the Middle Ages, pp. 314-315

In the Royal Frankish Annals, he is mentioned as a Slavic duke Miliduoch () in relation to events that took place in the land of the Slavs, who are called Sorbs (), while in the Annales Maximiniani he is similarly recorded as Milidoch, a duke () in the land of the Slavs, who are called Sorbs (). Also, in the Chronicle of Moissac (), he is mentioned as „Milito” or „Melito”, a king who ruled over Sorbs ().

See also Polabian Slavs

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