Princess Maria Theresia of Liechtenstein (Maria Theresia Anna Felicitas; 11 May 1694 – 20 February 1772) was the heiress to the Silesian Duchy of Troppau (now Opava in Czech Republic). Countess of Soissons by marriage, she was the last person to hold the title. She had one son who predeceased her in 1734. Her son was engaged to Maria Teresa Cybo-Malaspina, duchess of Massa and heiress to the Principality of Carrara.

Her father was Fürst Johann Adam Andreas of Liechtenstein – who had purchased the counties of Vaduz and Schellenberg, which is now the modern state of Liechtenstein (although the first Prince to visit Vaduz did so only in 1844). Her mother, Princess Maria Theresa "Edmunda" of Dietrichstein was the great granddaughter of Adam von Dietrichstein (1527–1590), Hofmeister to the court of Emperor Rudolf II and buried in St Vitus Cathedral, Prague Castle.

Maria Theresia’s father had died in 1712 – and both her brothers before that.

In Vienna on 24 October 1713 Maria Theresia married Thomas Emmanuel, Count of Soissons and Governor of Antwerp (born on 8 December 1687), second son of Louis Thomas of Savoy-Carignano and his wife Uranie de La Cropte de Beauvais. They had one son, Eugenio Giovanni.

By this marriage she also became a Princess of Savoy, having married into a cadet branch of the reigning Dukes of Savoy. Her husband was a descendant of the Princes of Carignano, which been raised by Charles Emmanuel I, Duke of Savoy into a principality as an appanage for his third son, Thomas Francis. The house of Carignano developed two junior branches, those of Soissons and Villafranca.

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