Duke Henry III of Mecklenburg was a notable nobleman from the House of Mecklenburg. He ruled as Duke of Mecklenburg from 1352 until his death in 1383. His reign was marked by efforts to strengthen the duchy and manage its internal affairs, particularly during a time of political instability in the region. Henry III was also known for his involvement in various alliances and conflicts, which were common among European nobility during the Middle Ages. His leadership contributed to the development of the Mecklenburg region, influencing its political landscape and relationships with neighboring territories.