Princess Maria Theresia von Thurn und Taxis (born Maria Theresia Ludowika Klothilde Helene Alexandra Prinzessin von Thurn und Taxis, 28 November 1980 in Regensburg), is a German forest and agricultural landowner and member of the former German princely House of Thurn und Taxis. Along with her siblings, her family owns one of Europe's largest private estates. Maria Theresia rose to prominence in 2001 when she sued for compensation the publishing house Heinrich Bauer Verlag for publishing with the aid of a photomontage a claim that she was to be the future fiancée of Spanish crown prince, Felipe, Prince of Asturias.

Maria Theresia is the eldest child and daughter of Johannes, 11th Prince of Thurn and Taxis and his wife Gloria, Princess of Thurn and Taxis (née Gräfin von Schönburg-Glauchau). Maria Theresia's family's lands form one of the largest private estates in Europe. After the death of her father in 1990, Maria Theresia was a joint heir, along with her sister Elisabeth von Thurn und Taxis and Albert, 12th Prince of Thurn and Taxis, to one of the largest privately owned forests in Europe, consisting of 36,000 hectares. She and her siblings are the largest private landowners in Germany.

Maria Theresia attended elementary school and secondary school in Regensburg where she lived with her family at Schloss St. Emmeram. To acquire her qualification for university entrance (German: Hochschulreife), Maria Theresia's mother shielded her from the German media by sending her to England to complete her secondary education. From 2002, Maria Theresia studied sociology, psychology, and communications in Madrid. Since 2004, she studied communications and media studies with a focus on film and directing in London.

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