Pierre de Cossé, 12th Duke of Brissac (13 March 1900 – 4 April 1993), was a French aristocrat and author who wrote historical memoirs.

He held the French noble title of Duke of Brissac from 1944 to 1993.

His father-in-law was Eugène Schneider II, while Maurice Herzog was his son-in-law.

[1] His father, François de Cossé, was the 11th Duke of Brissac from 1883 to 1944.

[3] Moreover, he wrote the preface of Guide du protocole et des usages, a book on good manners written by Jacques Gandouin [fr] in 1979.