Léopold de Saussure (30 May 1866 – 30 July 1925) was a Swiss-born French sinologist, pioneering scholar of ancient Chinese astronomy, and officer in the French navy.
After a naval career which took him to Indochina, China, and Japan, he left the service and devoted the rest of his life to scholarship.
He was most famous for his studies of ancient Chinese astronomy.
He was the younger brother of Ferdinand de Saussure, the pioneering linguist and semiotician, and René de Saussure, a Swiss Esperantist and mathematician.