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Hedy Lamarr (/ˈhɛdi/; born Hedwig Eva Maria Kiesler, 9 November 1914 – 19 January 2000) was an Austrian and American film actress and inventor. After an early and brief film career in Germany, which included a controversial love-making scene in the film Ecstasy (1933), she fled her husband and secretly moved to Paris. While there, she met MGM head Louis B. Mayer, who offered her a movie contract in Hollywood where she became a film star from the late 1930s to the 1950s. Mayer and the studio cast her in glamorous parts alongside popular leading men, and promoted her as the "world's most beautiful woman."

During her film career, Lamarr co-invented the technology for spread spectrum and frequency hopping communications, important to America's military during World War II in controlling its torpedoes. Those inventions have recently been incorporated into Wi-Fi, CDMA and Bluetooth technology, and led to her being inducted into the National Inventors Hall of Fame in 2014.