Jacques Cambry (2 October 1749 – 31 December 1807) was a Breton writer and expert in Celtic France. An early proponent of what came to be called Celtomania, he was the founder of the Celtic Academy, the forerunner of the Societé des Antiquaires de France. In addition, he is still honored as the "inventor" of the Oise département and praised for his contributions to the regional Breton identity as well as the national identity of post-Revolutionary France.