Helene Kottanner was a Hungarian courtier and writer. Her last name is spelled variously as Kottanner, Kottanerin, or Kottannerin. She is primarily known to history as the author of memoirs about the years 1439 and 1440, when king Albert II of Germany died and his son Ladislaus the Posthumous was born. Kottanner, who dictated her life story in German, was a kammerfrau to Queen Elizabeth of Luxembourg (1409–1442). She also assisted Queen Elisabeth in a royal succession plot.

Ladislaus V, more commonly known as Ladislaus the Posthumous, was Duke of Austria and King of Hungary, Croatia and Bohemia. He was the posthumous son of Albert of Habsburg with Elizabeth of Luxembourg. Albert had bequeathed all his realms to his future son on his deathbed, but only the estates of Austria accepted his last will. Fearing an Ottoman invasion, the majority of the Hungarian lords and prelates offered the crown to Vladislaus III of Poland. The Hussite noblemen and towns of Bohemia did not acknowledge the hereditary right of Albert's descendants to the throne, but also did not elect a new king.