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Ferdinand Karel Adolf Constantijn Leenhoff (24 May 1841 - 25 April 1914) was a Dutch painter and sculptor.
He was born in Zaltbommel to Carolus Antonius Leenhoff (1807-1878), a carillonneur and music professor, and Martina Adriana Johanna Ilcken (1807-1876). Around 1847, Ferdinand, his mother and some of his siblings moved to Paris to live with Ferdinand's grandmother. There his sister Suzanne met and later married the painter Édouard Manet, in the centre of whose Le Déjeuner sur l'herbe (1863) Leenhoff appears.
Leenhoff studied under Joseph Mezzara in Paris, with Mezzara later marrying Leenhoff's sister Mathilde. He later returned to the Netherlands and from 1890 to 1899 taught at Amsterdam's Rijksakademie van beeldende kunsten, before dying in Nice in 1914.
- Paris, cimetière de Passy : Bust of Édouard Manet, bronze, on the painter's grave · .
- Amsterdam, Thorbeckeplein : Monument to Johan Rudolf Thorbecke, 1876.
- Hoorn : Monument to Jan Pieterszoon Coen, 1887.
- Utrecht, Domplein, in front of the Academiegebouw : Monument to Queen Wilhelmina of the Netherlands, 1892.