Adelaide of Holstein-Rendsburg

Adelaide of Holstein-Rendsburg (c. 1299–January 1350) was the daughter of Count Henry I of Holstein-Rendsburg and Helwig of Bronckhorst. In 1313 she married Duke Eric II of Schleswig, who died in 1325, and after his death she married Count Dietrich V of Hohnstein-Heringen.

By Eric she was the mother of Valdemar III, king of Denmark from 1326 to 1329 and later duke of Schleswig, and of Helvig, who married King Valdemar IV in 1340; both her son and her son-in-law therefore wore the Danish crown.