Louis Philippe Marie "Alexandre" Berthier, 3rd Prince of Wagram (24 March 1836, Paris – 15 July 1911, Château de Grosbois) was a French nobleman and prince of Wagram.

He was the son of Napoléon Alexandre Berthier and Zénaïde Françoise Clary and grandson of Louis Alexandre Berthier, who had been Chief of Staff to Napoleon I.

[1] On 24 March 1882 he married Bertha Clara von Rothschild (1862–1903), daughter of Mayer Carl von Rothschild.

The couple had three children:[1] The 2nd, the 3rd and the 4th Prince of Wagram are buried at the Château de Grosbois.

[2] This biography of a French peer or noble is a stub.