Louis Hercule Timoléon de Cossé-Brissac, Duke of Brissac (14 February 1734, Paris - 9 September 1792, Versailles) was a French military commander and peer of France.
He was the second son and eventual heir of Jean Paul Timoléon de Cossé Brissac, 7th Duke of Brissac, who was a French general.