Countess (later Princess) Augusta Caroline Sophie Reuss of Ebersdorf (German: Gräfin Reuß zu Ebersdorf) (19 January 1757 – 16 November 1831), was by marriage a duchess of Saxe-Coburg-Saalfeld. She was born in Saalburg-Ebersdorf. She was the maternal grandmother of Queen Victoria and the paternal grandmother of Albert, Prince Consort.

She was the second of seven children of Heinrich XXIV, Count Reuss of Ebersdorf and his wife Karoline Ernestine of Erbach-Schönberg. Her birthplace, Ebersdorf, was a center of Pietism in Thuringia and Augusta's grandparents were ardent admirers of this religious movement. Augusta's great-aunt Countess Erdmuthe Dorothea, by marriage Countess of Zinzendorf, was married to the founder of the Moravian Church. This background explains the deep religious feelings of Princess Augusta in later years.

Augusta was one of the most beautiful women of her time. Her father commissioned a portrait of Augusta as Artemisia by the painter Johann Heinrich Tischbein. Count Heinrich XXIV showed this painting during the Perpetual Diet so potential marriage candidates were aware of his beautiful daughter.

In Ebersdorf on 13 June 1777 Augusta married Franz Frederick Anton, Duke of Saxe-Coburg-Saalfeld. Duke Franz previously acquired the Artemisia painting for four times the original price because he was deeply in love with Augusta, but he had to marry a relative, Princess Sophie of Saxe-Hildburghausen. Princess Sophie died seven months after the wedding, so the Duke was free to pursue the hand of his beloved.

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