Jean-Paul-François, 5th duc de Noailles (October 26, 1739–October 20, 1824), son of Louis, 4th duc de Noailles, was in the army, but his tastes were scientific, and for his eminence as a chemist he was elected a member of the Académie des sciences in 1777. Knight of Golden Fleece
He became duc d'Ayen in 1766 on his grandfather's death, and duc de Noailles on his father's in 1793. Having emigrated in 1792, he lived in Switzerland until the Restoration in 1814, when he took his seat as a peer of France.
His first wife, Anne-Louise-Henriette d'Aguessau , bore eight daughters, of which five survived to adulthood, including Marie-Adrienne-Françoise , wife of Gilbert Du Motier, marquis de La Fayette. Although the duke remarried, he had no further children. Having no son, he was succeeded as duc de Noailles by his grand-nephew, Paul.
