Jules Gaucher (13 September 1905 – 13 March 1954) was a French Army officer noted for his command of Foreign Legion troops in Indochina. Described as a "burly, hard-drinking veteran of years of jungle fighting, with a nose like an axe-blade and a mouth like its cut", Gaucher was a popular commander among the Legion, known as 'the Old Man' to his troops. He was killed at the Battle of Dien Bien Phu in 1954.