Erdmuthe Maria Theresia of Dietrichstein (17 April 1662 – 16 March 1737), was an Austrian noblewoman, by birth a member of the princely Dietrichstein family and by marriage Princess of Liechtenstein.
Born in Nikolsburg, she was the fifth child and second (but eldest surviving) daughter of Ferdinand Joseph, 3rd Prince of Dietrichstein, and Marie Elisabeth, a daughter of Johann Anton I, Prince of Eggenberg, Duke of Ceský Krumlov and Princely Count (gefürsteter Graf) of Gradisca d'Isonzo.