Johan von Mangelsen (12 September 1694 – 24 February 1769) was a Norwegian military officer and businessperson.
He was born in Berg (current Halden), and was married to Cathrine Bugball, a daughter of Sara Hammond.
He was Norways's principal representative at the border negotiations with Sweden between 1743 and 1751.
Through his marriage, Mangelsen became a significant shareholder of the Røros Copper Works, and took actively part in the business.
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