Countess Auguste von Harrach (30 August 1800 – 5 June 1873), was the second spouse of King Frederick William III of Prussia.
Since the marriage was morganatic, she was not named Queen, but was given the titles Princess von Liegnitz (modern-day Legnica) and Countess von Hohenzollern.
Frederick reportedly stated, that he did not wish to have another queen after his first one.