Alexandre Louis Philippe Marie Berthier, 4th Prince de Wagram (20 July 1883 – 30 May 1918) was a French nobleman and an art collector.

Born as the son of Alexandre Berthier, 3rd Prince of Wagram (1836–1911) and Baroness Bertha Clara von Rothschild (1862–1903^[1]), member of the German branch of the prominent Rothschild family. The family resided in the ancestral home, the Château de Grosbois, a large estate in Boissy-Saint-Léger, southeast of Paris. He had two sisters, Elisabeth (1885–1960) and Marguerite (1887–1966) of whom the latter married Prince Jean Victor de Broglie.^[1]

Alexandre Berthier was an active collector of modern art.^[2] He owned works by Alfred Sisley, Camille Pissarro, Claude Monet and Pierre-Auguste Renoir. Of the last he bequeathed 17 to the French nation in his will.^[1]

Berthier bequeathed Grosbois to his sister before leaving for the Army and World War I on 1 August 1914. An army captain and the leader of a company of chasseurs during the Third Battle of the Aisne, he sustained wounds from shell fire at Fort de Condé-sur-Aisne and died from them on 30 May 1918. He had no issue.^[1][3] He was buried at the Château de Grosbois like his father and grandfather.^[4]