Auguste, Duke of Leuchtenberg

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Prince Auguste
Duke of Navarre, Duke of Santa Cruz
Portrait by G. Dury, c. 1835
Prince consort of Portugal
Tenure	26 January 1835 – 28 March 1835
Duke of Leuchtenberg Prince of Eichstätt
Tenure	21 February 1824 – 28 March 1835
Predecessor	Eugène de Beauharnais
Successor	Maximilian de Beauharnais
Born	(1810-12-09)9 December 1810 Milan, Lombardy
Died	28 March 1835(1835-03-28) (aged 24) Lisbon, Portugal
Burial	Pantheon of the House of Braganza
Spouse	Maria II of Portugal ​ ​ (m. 1835)​
Names Auguste Charles Eugène Napoléon de Beauharnais
House	Beauharnais
Father	Eugène de Beauharnais
Mother	Princess Augusta of Bavaria
Coat of Arms of Auguste

Auguste Charles Eugène Napoléon de Beauharnais, Duke of Leuchtenberg (9 December 1810 – 28 March 1835) was the first prince consort of Maria II of Portugal. Besides being the 2nd Duke of Leuchtenberg and 2nd Prince of Eichstätt, he also held the Brazilian noble title of Duke of Santa Cruz.