Leopoldine Konstantin was an Austrian stage and screen actress. She made her debut in the Deutsches Theater in Berlin in 1907 in Frank Wedekind's Spring Awakening (1907), and Shakespeare's Romeo and Juliet (1907).

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Leopoldine Konstantin was an Austrian stage and screen actress who began her career in Berlin's Deutsches Theater before transitioning to European silent and sound films and later Hollywood cinema.
She is best remembered internationally for playing Claude Rains's intimidating mother, Madame Sebastian, in Alfred Hitchcock's 1946 thriller Notorious, alongside numerous European theater and film roles.