Otto Reinhold Ludwig von Ungern-Sternberg was a Polish chamberlain and envoy as well as Baltic German shipowner and landowner.

He was chamberlain and envoy of Stanislaus II August Poniatowski to the Tsar Catherine the Great at Peterhof Palace.

In 1781 he acquired the Gutshof Großenhof on Dagö,[2] continued to be Lord at Neukusthof in Livonia as well as at Neuenhof, Hohenholm, Pardas and Putkas in Estonia.

There he worked in administration during the reign of Emperor Alexander I. Ungern had been married to Magdalene Charlotte von der Pahlen (* 1749; † 1824) since 1772, with whom he had four children.

[3][4] István Csekey scientifically investigated the accusation of piracy against Ungern in 1928 and conducted it ad absurdum.