Louis Charles Marie de La Trémoille, 10th Duke of Thouars (28 March 1863 – 17 June 1921), 10th Duke of Thouars, 16th Count of Laval was a French nobleman.
He was the son of Louis Charles de La Trémoille and his wife Marguerite Églé Jeanne Caroline Duchâtel (daughter of Count Charles Marie Tanneguy Duchâtel and his wife Rosalie (née "Eglé") Paulée).
[2] On 1 February 1892, he married Hélène Marie Léonie Pillet-Will (1875–1964), the daughter of Count Frédéric Pillet-Will and his wife, Jeanne Marie Clotilde Briatte.
[2] As his son Louis was killed in a fire at the estate of L. Hamilton McCormick in Whitchurch, Hampshire in 1933,[3][4] his daughter Charlotte then inherited his titles, however, this has been disputed.
[2] Through his daughter Princess Antoinette, he was a grandfather of Antonin, 9th Duke d'Ursel.