Jean Élie Octave Louis Sévère Amanien Decazes de Glücksbierg, 3rd Duc Decazes and 3rd Duke of Glücksbierg (1864–1912), was a French aristocrat and sportsman. A member of the Yacht Club de France, Jean Decazes won a silver medal sailing at the 1900 Summer Olympics in Paris in the 10 to 20 ton class. The following year he captured the 1901 Coupe de France again using his sailboat Quand-Même II.