Molly Costain Haycraft (6 December 1911 – 5 June 2005) was a Canadian author. She was born in Toronto, Ontario, Canada, and spent her childhood in Philadelphia, where her father, the well-known novelist Thomas B. Costain, was an editor for The Saturday Evening Post. She was the author of several novels about women in English royal history.
Molly Haycraft (6 December 1911 – 5 June 2005) was a Canadian author. Born in Toronto, Ontario, Canada, she spent her childhood in Philadelphia, where her father, the acclaimed novelist Thomas B. Costain, worked as an editor for The Saturday Evening Post. She wrote novels about women's lives in English royal history.