Jean Riolan (the Younger) (15 February 1577 or 1580 - 19 February 1657) was a French anatomist who was an influential member of the Medical Faculty of Paris. His father, Jean Riolan (the Elder) (1539-1605) was also a noted French anatomist. Riolan was the personal physician to Marie de' Medici (1553-1642) for all his life.

The eponymous "anastomosis of Riolan" is named after him, which