Joseph Barsalou (1600–1660) was a French apothecary and physician.
Joseph Barsalou was born in Agen in the south west of France. He came from a family of apothecaries that was originally from Narbonne. Joseph Barsalou received no formal medical training. His father handed down his knowledge of herbs and minerals. It is through his friendship with the Scaliger family that Joseph Barsalou gained access to the library of Julius Caesar Scaliger and his son Joseph Justus Scaliger. Julius Caesar Scaliger was a physician, philosopher and commentator of Aristotle. His son Josephus Justus Scaliger was a scholar, linguist and historian. Joseph Barsalou built on his traditional knowledge of herbs with an introduction to medicine and philosophy reading Galen, Aristotle and Pythagoras.
Agen in the early 17th century was at the crossroads of the religious debate revolving around the new Protestant faith. The region favoured the Reformation. Nerac its neighbour and rival was the political and intellectual capital of French Protestants. The Edict of Nerac in 1579 had given the French Protestant 14 more protected towns and confirmed the Edict of Poitiers that recognised the religious rights of Protestants in France. Josephus Justus had been seduced by the Reformation and become one of its great scholars. Yet Joseph Barsalou's life took a different direction from his predecessor. Joseph Barsalou gravitated towards Avignon and Rome the centers of Roman Catholic Church.
As a physician Joseph Barsalou treated people in and around the town of Agen. With the many political and religious battles being fought nearby the region was rife with disease: tuberculosis, typhus, scurvy and other fevers. Many physicians actually died from being in contact with the patients they treated. Joseph Barsalou survived. Locally his reputation was built as much on treating others as surviving the contact with so many instances of disease. It testified to his skills as a physician.