Alla Nazimova (Russian and Ukrainian: Алла Назимова; 3 June [O.S. 22 May] 1879 – 13 July 1945) was an American film and theatre actress, a screenwriter, and film producer. She is perhaps best known as simply Nazimova, but also went under the name Alia Nasimoff. She emigrated to the United States from the Russian Empire. In 1927, Nazimova became a naturalized citizen of the United States.

She was signed up by the American producer Henry Miller and made her Broadway debut in New York City, in 1906 to critical and popular success. She quickly became extremely popular (a theatre was named after her) and remained a major Broadway star for years, often acting in the plays of Henrik Ibsen and Anton Chekhov. Dorothy Parker described her as the finest Hedda Gabler she had ever seen.