Anne Marie Timoléon François de Cossé, 11th Duke of Brissac (1868–1944), was a French aristocrat and author.

He held the French noble title of Duke of Brissac from 1883 to 1944 and was educated at the École militaire de Saint-Cyr.

[1] His maternal grandfather, Louis Say, was the founder of the Say sugar empire (now known as Béghin-Say, a subsidiary of Tereos).

He graduated from the École spéciale militaire de Saint-Cyr, a military academy in Brittany, France.

[1] He wrote a historical book about the Austrian court, titled Un Carrousel à la cour d'Autriche.