Kathleen (Kay) Amelia Rex was a Canadian reporter and writer. She was born in 1918, the daughter of Lionel and Grace Rex of Woodstock, Ontario. In 1941, after graduating from university, Rex began work with the Woodstock Sentinel, a local daily newspaper, moving to the Canadian Press (CP) in 1942, where she worked in various CP bureaus across the country including Vancouver, Ottawa and Toronto. In 1953, Rex left the Canadian Press, thereafter gaining employment with the Canadian Broadcasting Corporation (CBC). In 1957 she began work as a freelance journalist, traveling first to Mexico City. In 1959 Rex joined the Globe and Mail where she worked until 1983. Her stories brought to the paper an early form of feminism, highlighting women's issues including poverty, daycare, immigration, health, employment and peace.

Upon retirement from the Globe and Mail, Rex became president of the Toronto Branch of the Canadian Authors Association. Her retirement from journalism also allowed Rex to begin research on a history of the Canadian Women's Press Club of which she was a member. Published in 1995, No Daughter of Mine: The Women and History of the Canadian Women's Press Club, 1904-1971 tells the stories of the female journalists who were its members. Rex died on July 10, 2006 in Toronto and was interred at Woodstock Presbyterian Cemetery.