Eleonora Elisa Fiaschi Tennant (19 December 1893 – 11 September 1963) was an Australian political activist best known for her involvement with far-right politics in England. She and her husband Ernest Tennant had links with Nazi Germany and she was an outspoken anti-Semite. She stood for the House of Commons on two occasions, as a Conservative in 1931 and as an Independent Conservative in 1945. She returned to Australia in 1952 and was a Democratic Labor candidate for the Senate in 1961.