Leopold of Schleswig-Holstein-Sonderbourg-Wiesenbourg (Brzeg, 12 January 1674 - Vienna, 4 March 1744) was the 3rd Duke of Schleswig-Holstein-Sonderburg-Wiesenburg and Knight in the Order of the Golden Fleece since 1721.
Since 1721 he owned Wetzdorf Castle, which he inherited from his aunt Duchess Magdalena Sophie Eleonora von Schleswig-Holstein (1664–1720), abbess in Quedlinburg.
On 25 June 1723, he acquired from his father for 110,000 thaler, Wiesenburg Castle with the associated lands.
He then went to Vienna, where he was a member of the Imperial council at the court of Charles VI.
[1] Leopold converted to the Catholic faith and married on 3 May 1715 with Princess Maria Elisabeth von Liechtenstein (1683–1744), daughter of Hans-Adam I, Prince of Liechtenstein They had five daughters :