Reinhold Hanisch (27 January 1884, Grünwald an der Neiße (Czech: Mšeno nad Nisou) near Gablonz/Neiße, northern Bohemia, Imperial & Royal Austria – 2? February (death date controversial) 1937, in Vienna, aged 53) was an Austrian migrant worker and sometime business partner of the young Adolf Hitler.
Hanisch, who published articles on Hitler, with whom he had lived in 1910, is, next to August Kubizek, one of the few witnesses to Hitler's Vienna years.