Ruth Fawcett (born 13 April 1961 in Malvern, England) is the daughter of British-Canadian physicist Eric Fawcett, and the sister-in-law of historian Roger Sarty. She is the author of Nuclear Pursuits, the biography of Canadian nuclear-industry pioneer Wilfrid Bennett Lewis.
Fawcett currently lives with her family in Ottawa, Canada. Her second cousin, Samuel Fawcett, is a NOVA teacher in Osaka, Japan.