Stefanie Rabatsch (née Isak; born 28 December 1887 – died unknown, after 1973) was an Austrian woman who was allegedly an unrequited love of then-teenage Adolf Hitler, a claim made by Hitler's childhood friend August Kubizek.
Her Jewish-sounding maiden name, Isak, has been subject to speculation in this context.
However, there is no evidence apart from Kubizek that Hitler ever had such an attachment.
Kubizek, a childhood friend and later biographer of his childhood experience with Hitler, wrote about Stefanie in his book, Adolf Hitler, My Childhood Friend.
He alleges that Hitler fell in love with her after she passed by him during her daily daughter-mother stroll in Linz, glancing at him.
In Kubizek's account, although in love with her to the point of suicide, Hitler never once spoke with her, and she later married an Austrian army officer.
Stefanie stated in interviews that she was unaware of Hitler's feelings towards her, and little is known about her life.
The one-sided relationship has been discussed in many books.
Some question the accuracy of Kubizek's memoir, the only source for the story.
Others accept that there is some basis of fact, but downplay the significance of the youthful infatuation, while yet others consider that it gives valuable insight into the development of Hitler's personality.