Princess Pauline of Saxe-Weimar-Eisenach (Pauline Ida Marie Olga Henriette Katherine; 25 July 1852, in Stuttgart – 17 May 1904, in Orte) was the wife of Charles Augustus, Hereditary Grand Duke of Saxe-Weimar-Eisenach.

She was a daughter of Prince Hermann of Saxe-Weimar-Eisenach and Princess Augusta of Württemberg.

On 26 August 1873 at Friedrichshafen, Baden-Württemberg, Pauline married Charles Augustus, Hereditary Grand Duke of Saxe-Weimar-Eisenach. They were second cousins, as she was the paternal granddaughter of Prince Bernhard, younger brother of the Charles Frederick, Grand Duke of Saxe-Weimar-Eisenach, the grandfather of Karl August.

Pauline and Charles Augustus had two sons:

Charles Augustus died on 22 November 1894 of inflammation of the lungs, at the age of 50. He never succeeded as Grand Duke of Saxe-Weimar-Eisenach. Consequently, Pauline was always known as Hereditary Grand Duchess, or after his death, Dowager Hereditary Grand Duchess. Their elder son William Ernest succeeded as Grand Duke.

In her final years, Pauline spent a lot of time in Italy, and was a frequent visitor to the Italian court. It was rumored that she entered into a morganatic marriage with her chamberlain. This marriage did not appear in the Almanach de Gotha, and was not approved by her son the Grand Duke. Consequently, the marriage was not sanctioned by the Saxe-Weimar government. She continued to be styled as grand duchess only by courtesy, as she was unpopular with her family and her son's subjects.

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