Henry III of Mecklenburg

Henry III (c. 1337–1383) was the eldest son of Duke Albert II of Mecklenburg and Euphemia of Sweden, and the heir to his father's Scandinavian ambitions. In 1362 he married Ingeborg, eldest daughter and potential heiress of King Valdemar IV of Denmark.

Their infant son was offered, unsuccessfully, as heir to Denmark against Valdemar's youngest daughter Margaret. After Ingeborg's death Henry married Matilda of Werle in 1377, and in 1379 he succeeded his father as duke of Mecklenburg.

He died at Schwerin on 24 April 1383 from a tournament accident at Wismar; his brother Magnus I and his son Albert IV took up joint rule.