| Princess Dorothea | |
| Full Name: | de|Dorothea Maria Henriette Auguste Louise |
| Succession: | Duchess consort of Schleswig-Holstein |
| Reign: | 2 August 1898 – 22 February 1921 |
| Reign-Type: | Tenure |
| Spouse: | Ernst Gunther, Duke of Schleswig-Holstein |
| House: | Saxe-Coburg and Gotha-Koháry |
| Father: | Prince Philipp of Saxe-Coburg and Gotha |
| Mother: | Princess Louise of Belgium |
| Birth Date: | 30 April 1881 |
| Birth Place: | Vienna, Austria-Hungary |
| Death Place: | Schloss Taxis, Dischingen, Baden-Württemberg, West Germany |
| Burial Place: | St. Augustin, Coburg |
Princess Dorothea Maria Henriette Auguste Louise of Saxe-Coburg and Gotha (30 April 1881 - 21 January 1967) was a princess of Saxe-Coburg and Gotha (de|Prinzessin von Sachsen-Coburg und Gotha) by birth and the duchess of Schleswig-Holstein (de|Herzogin zu Schleswig-Holstein) through her marriage to Ernst Gunther, duke of Schleswig-Holstein. Dorothea was born in Vienna, Austria, the second child and only daughter of Prince Philipp of Saxe-Coburg and Gotha and Princess Louise of Belgium.
Dorothea married Ernst Gunther, Duke of Schleswig-Holstein, fifth child and third-eldest son of Frederick VIII, Duke of Schleswig-Holstein and his wife Princess Adelheid of Hohenlohe-Langenburg, on 2 August 1898 in Coburg, Duchy of Saxe-Coburg and Gotha.
Dorothea and Ernst Gunther had no children. In 1920, they adopted Princess Marie Luise (1908–1969) and Prince Johann Georg of Schleswig-Holstein-Sonderburg-Glücksburg (1911–1941), son and daughter of Prince Albrecht of Schleswig-Holstein-Sonderburg-Glücksburg and his wife Countess Ortrud of Ysenburg und Büdingen. Marie Luise and Johann Georg were grandchildren of Friedrich, Duke of Schleswig-Holstein-Sonderburg-Glücksburg, an older brother of Christian IX of Denmark.
Princess Dorothea died at Schloss Taxis, Dischingen, Baden-Württemberg, Germany, aged 85.