Ethel Mary Doidge (1887–1965) was a British born, South African mycologist and bacteriologist.

Doidge was born in Nottingham, England on 31 May 1887 and was educated in South Africa at Epworth School in Pietermaritzburg and Huguenot College, Wellington, Western Cape.

Her services were retained for a further four years, during which time she completed her work on The South African fungi and lichens.

[3] Through her knowledge of bacteriology and mycology, she managed to solve problems of importance to agriculture.

She was a founding member of the South African Biological Society and in 1922 was given the Society's major award, the Senior Captain Scott Memorial Medal, for her research on South African plant pathology.