Siegfried III, Count of Weimar-Orlamünde (c. 1155 – 1206) was a member of the House of Ascania and a ruling Count of Weimar-Orlamünde.
He was the son of Count Herman I and his wife Irmgard.[1] Herman I was son of Albert the Bear Count of Anhalt, Margrave of Brandenburg and Duke of Saxony.
He was regarded as a supporter of the House of Hohenstaufen. He spent some time in Denmark. He married Sophie (1159 – c. 1208), a daughter of King Valdemar I of Denmark and had two sons:
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