Philippe Jacques Rühl (3 May 1737 – 29/30 May 1795) was a statesman during the French Revolution, best remembered as the doyen d'âge (oldest deputy) of the opening session of the Convention of 1792–1795.

With the advent of French Revolution, he returned to his native Alsace, where he became an administrator of the Département of Bas-Rhin under the new regime created by the National Assembly.

He was dispatched as Representative on a Mission to departments of Marne and Haute-Marne (16 September 1793 – 3 November 1793) to assist in arranging the levée en masse (military conscription).

Rühl was designated for yet another mission, this time to Bas-Rhin and Haut-Rhin, 24 July 1794, but did not depart until 1 August 1794, and so he was in Paris to witness the fall of Robespierre.

He was called before the military commission on 28 May 1795 and committed suicide by stabbing himself with a dagger, a precursor of the "Martyrs of Prairial" (Romme, Goujon, Duquesnoy, Soubrany, Duroy, and Bourbotte).