Capitaine (later Colonel) Henri Joseph Marie Hay de Slade (29 May 1893 – 2 November 1979) was a French World War I flying ace credited with 19 aerial victories.

He was notable for taking command of fighter squadron Escadrille Spa.159 when it had suffered 13 losses without a victory, and turning it into an efficient fighting force.

[3] Hay de Slade left the army in 1926 to become a gentleman-farmer in the village of Derval, where he had inherited a domain from his family.

During World War II he was briefly mobilized with the rank of commandant, with a special assignment to direct an aviation factory.

Hay de Slade was formally "dismissed as mayor but continued to open the mail and to give orders, in conjunction with the curé, as if he were still in office.