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 Siegfried, 4th Prince of Castell-Rüdenhausen (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.