Princess Marianne of the Netherlands, Princess of Orange-Nassau (Wilhelmina Frederika Louise Charlotte Marianne; 9 May 1810 – 29 May 1883), was a member of the House of Orange-Nassau, by birth Princess of the Kingdom of the United Netherlands and by marriage Princess of the Kingdom of Prussia.

Born in Berlin, she was the youngest child and second daughter of King William I of the Netherlands by his wife Wilhelmine of Prussia. Her elder sister, Pauline, had died in 1806, long before her birth, so Marianne became the only daughter of her parents to survive adulthood. Her two older brothers were the future King William II and Prince Frederik of the Netherlands. Two other brothers were stillborn.

In The Hague on 14 September 1830, Marianne married her first cousin Prince Albert, the fourth son of her mother's brother, King Frederick William III of Prussia. The union produced five children:

In 1845 she left her unfaithful husband and began to live with her lover and former coachman Johannes van Rossum (). On 28 March 1849, Marianne and Albert of Prussia were formally divorced. Seven months later (30 October) in Cefalù, Sicily, she gave birth to her only child with van Rossum, a son, called Johannes Willem van Reinhartshausen (). After this, the courts of The Hague and Berlin broke all contact with her. Marianne, Johannes and their son spent the following years in Italy and from 1853 at Weißwasser Castle near Jauernig.

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