Henry Borwin III, Lord of Rostock (c. 1220 – 1 August 1278) was a member of theHouse of Mecklenburg. He ruled the Lordship of Rostock jointly with his brothers from 1226 to 1234, then ruled alone until his death.

He was the second youngest son ofHenry II Borwin, who became Lord ofRostock in 1225. Since Henry Borwin III was still a minor when his father died in 1226, his brotherNicholas I acted as regent until 1234. During this period, Mecklenburg again became afief of the Duchy of Saxony. In 1234, the brothers divided Mecklenburg among themselves; Hernry Borwin III received the Lordship of Rostock.

Henry Borwin III came into conflict with the emergingHanseatic cities ofRostock andWismar. He also waged war on his brothers. After the overthrow ofPribislaw I, Henry Borwin gained control of a part ofParchim-Richenberg.

During a war against Pomerania, he conqueredCircipania, including the cities ofGnoien andKalen, in 1236. He assistedDenmark in the war againstHolstein.

Henry Borwin III died in 1278 and was buried inDoberan.

In 1237, he married Sophia of Sweden (died before 24 June 1241), the daughter of KingEric X of Sweden. They had four children:

• John (died before 27 October 1266), co-regent with his father from 1262
• Waldemar, lord of Rostock (1278-1282)
• Henry, died young
• Eric, also died young

• Wigger, Friedrich (1885)."Stammtafeln des Großherzoglichen Hauses von Meklenburg".Jahrbücher des Vereins für Mecklenburgische Geschichte und Altertumskunde.50:111–326.

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