Countess Donata of Castell-Rüdenhausen (German: Donata Gräfin zu Castell-Rüdenhausen; 20 June 1950 – 5 September 2015) was a German noblewoman. She was the daughter of (1916–2007), head of the Rüdenhausen branch of the House of Castell, and his wife, Countess Irene of Solms-Laubach (1925–2006). She was the mother of Prince Georg Friedrich of Prussia (born 1976) the current head of the House of Hohenzollern, the ruling dynasty of the German Empire and of the Kingdom of Prussia until 1918.

Countess Donata of Castell-Rüdenhausen was born on 20 June 1950 at the Castle of Rüdenhausen, Unterfranken, Germany to (1916–2007), head of the Rüdenhausen branch of the House of Castell and his wife Countess Irene of Solms-Laubach (1925–2006). Donata was the third born child of her parents and the only daughter of eight children. She was raised Lutheran. After Abitur at Wiesentheider Gymnasium she made an apprenticeship of three years as a nurse at the German Red Cross Hospital in Würzburg.

On 24 May 1975 at the Lutheran St. Peter and Paul Church in Rüdenhausen Donata married Prince Louis Ferdinand of Prussia (1944–1977), son of Prince Louis Ferdinand of Prussia (1907–1994) and his wife Grand Duchess Kira Kirillovna of Russia (1909–1967). After the wedding the young couple lived in Bremen, where Louis Ferdinand worked at a bank.

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