Tilly Armstrong (8 April 1927 – 6 July 2010) was a British writer of romance novels from 1978 to 1998. She also wrote as Tania Langley and Kate Alexander. Armstrong was born in Sutton, Surrey. Before she began her writing career, she worked for the World Health Organization in Geneva, then in Canada for 18 months, and then became the personal secretary to the Chairman of British Steel, Lord Melchett. She was the fourteenth elected Chairman (1987–1989) of the Romantic Novelists' Association, and was one of its Vice-Presidents, until her death at 83, on 6 July 2010, at Carshalton, England, UK.