Jean Élie Octave Louis Sévère Amanien Decazes de Glücksbierg, 3rd Duc Decazes and 3rd Duke of Glücksbierg (April 30, 1864 – August 31, 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 the 10 to 20 ton class.

The following year he captured the 1901 Coupe de France again using his sailboat Quand-Même II.

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