August ("Gustl") Kubizek (died in Eferding) was a close friend of Adolf Hitler when both were in their late teens. He later wrote about their friendship.
This memoir by August Kubizek of his friendship with Adolph Hitler from their youthful days in Linz to their days as roommates in Vienna is as interesting for its depiction of pre-WWI life in the Austro-Hungarian Empire as it is for the insights it provides to the personality and formative experiences of Adolph Hitler. After Hitler rose to power he and his low-level municipal bureaucrat friend were re-introduced after having lost contact for decades. While distancing himself from Hitler's racist and nationalist politics the author freely admitted to his American interrogators after World War II that Hitler was his friend.