Baroness Alida Maria Laura Altenburger von Marckenstein-Frauenberg (31 May 1921 – 22 April 2006), better known by her stage name Alida Valli (or simply Valli), was an Italian actress who appeared in more than 100 films, including Mario Soldati's Piccolo mondo antico, Alfred Hitchcock's The Paradine Case, Carol Reed's The Third Man, Michelangelo Antonioni's Il Grido, Luchino Visconti's Senso, Bernardo Bertolucci's 1900, Georges Franju's Les Yeux sans Visage, and Dario Argento's Suspiria.
Valli was born in Pola, Istria, Italy (today Pula, Croatia; until 1918 it had formed part of Austria-Hungary). Her paternal grandfather was the Baron Luigi Altenburger (also: Altempurger), an Austrian-Italian from Trento, a descendant of the Counts d'Arco; her paternal grandmother was Elisa Tomasi from Trento, a cousin of the Roman senator Ettore Tolomei. Valli's mother, Silvia Oberecker della Martina, born in Pola, was the daughter of Felix Oberecker (also: Obrekar) from Laibach, Austria (now Ljubljana, Slovenia); her mother was Virginia della Martina from Pola, Istria (then part of Austria). Valli's maternal granduncle, Rodolfo, was a close friend of Gabriele D'Annunzio. Valli was christened Baroness Alida Maria Laura Altenburger von Marckenstein-Frauenberg. During her lifetime she also gained the titles Dr.h.c. of the III. University of Rome, Chevalier of Arts of France and Cavaliere of the Italian Republic.