Henri du Plessis-Guénégaud, Lord of the Plessis-Belleville, Marquis de La Garnache (1610 – 16 March 1676) was a French scholar who was Secretary of State of the royal household, and Naval Minister.
He was Son of Gabriel Guénégaud, Lord of the Plessis-Belleville 1638 and Marie La Croix, Dame du Plessis-Belleville 1655. He married Isabel de Choiseul; they had children:
He was the brother of Claude's treasurer, brother-in-law of César d'Albret who married his sister Madeleine.
It was as secretary to Dubuisson Aubenay. He built the hôtel Guénégaud.