Tilly Losch (* 15. November 1903 in Wien; † 24. Dezember 1975 in New York City; gebürtig Ottilie Ethel Losch) war eine österreichische Tänzerin, Schauspielerin, Choreografin und Malerin. ()
Ottilie Ethel Leopoldine "Tilly" Losch, Countess of Carnarvon was an Austrian-born dancer, choreographer, actress and painter. She studied ballet from childhood at the Vienna Opera, making her debut in 1913 in Louis Frappart's 1885 Wiener Walzer. Her film debut was in Richard Boleslawski "The Garden of Allah" (1936).