Erdmann II, Count von Promnitz (born 22 August 1683 in Sorau, Electorate of Saxony (now Żary, Poland); died: 7 September 1745 at the forest castle near Żary) was Lord of Żary (German: Sorau) and Trzebiel (German: Triebel) in Lower Lusatia, and Pszczyna (German: Pless) in Upper Silesia.

[1] He served Augustus II the Strong, elector of Saxony and king of Poland, and later his son and successor Augustus III as Privy Councillor and as cabinet minister.

In 1703, Erdmann II inherited his father's vast estates.

Erdmann von Promnitz brought Wolfgang Caspar Printz and Georg Philipp Telemann as Kapellmeister to his court in Sorau.

They had the following children: He later married his second wife, Henriette Eleonore (1 January 1706 – 7 April 1762), daughter of Heinrich XV, Count of Reuss-Lobenstein (1674–1739).