Margaret Rigsby Becklake, CM GOQ (born May 27, 1922) is a Canadian academic and epidemiologist. Born in London, England, Becklake grew up in Pretoria, South Africa and received a MB and BCh degree in 1944 from the University of the Witwatersrand. She interned at the Johannesburg General Hospital and did postgraduate studies at the British Postgraduate Medical School. In 1950, she became a Junior Lecturer in Medicine at the University of the Witwatersrand.