Jean-Jacques Barthélemy (20 January 1716 – 30 April 1795) was a French writer and numismatist.
Barthélemy was born at Cassis, in Provence, and began his classical studies at the College of Oratory in Marseilles. He took up philosophy and theology at the Jesuits' college, and finally attended the seminary of the Lazarists. While studying for the priesthood, which he intended to join, he devoted much attention to oriental languages, and was introduced by a friend to the study of classical antiquities, and particularly to the field of numismatics.
In 1744, he went to Paris with a letter of introduction to Claude Gros de Boze, Perpetual Secretary of the Académie des inscriptions et belles-lettres and Keeper of the Royal Collection of Medals. He became assistant to de Boze and in 1753 succeeded him in this post, remaining in this position until the Revolution. During his term of office he nearly doubled the size of the collection.
In 1755, he accompanied the French ambassador, de Stainville to Italy, where he spent three years in archaeological research. Choiseul had a great regard for Barthélemy, and on his return to France, Barthélemy became an inmate of his house, and received valuable preferments from his patron. In June 1755 he was elected a Fellow of the Royal Society of London. In 1789, after the publication of his Voyage du jeune Anacharsis en Grèce dans le milieu du IVe siècle, he was elected a member of the Académie française.