Duchess Cecilie of Mecklenburg-Schwerin (Cecilie Auguste Marie; 20 September 1886 – 6 May 1954) was the last German Crown Princess and Crown Princess of Prussia as the wife of German Crown Prince Wilhelm, the son of German Emperor Wilhelm II.

Cecilie was a daughter of Frederick Francis III, Grand Duke of Mecklenburg-Schwerin and Grand Duchess Anastasia Mikhailovna of Russia. She was raise with simplicity and her early life was peripatetic spending summers in Mecklenburg and the rest of the year in the south of France. After the death of her father, she traveled every summer between 1898 and 1904 to her mother's native Russia. On 6 June 1905, she married German Crown Prince Wilhelm. The couple had four sons and two daughters. Cecile, tall and statuesque, became popular in Germany for her sense of style. However, her husband was a womanizer and the marriage was unhappy.

After the fall of the German monarchy, at the end of World War I, Cecile and her husband lived mostly apart. During the Weimar Republic and the Nazi period, Cecilie lived a private life mainly at Cecilienhof Palace in Potsdam. With the advance of the Soviet troops, she left Cecilienhof to never come back in February 1945. She settled in Bad Kissingen until 1952 when she moved to an apartment in the Frauenkopf district of Stuttgart. In 1952, she published a book of memoirs. She died two years later.

Born on 20 September 1886 in Schwerin, Cecilie was the younger daughter of Frederick Francis III, Grand Duke of Mecklenburg-Schwerin and Grand Duchess Anastasia Mikhailovna of Russia. She spent most of her childhood in Schwerin, at the royal residences of Ludwigslust Palace and the Gelbensande hunting lodge, only a few kilometres from the Baltic Sea coast. Her father suffered badly from asthma and the wet damp cold climate of Mecklenburg was not good for his health. As a result, Cecilie spent a large amount of time with her family in Cannes in the south of France, favoured at the time by European royalty, including some whom Cecilie met such as Empress Eugénie and her future husband's great-uncle, Edward VII.

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