Georgiana May Bonser (née Duthie; 5 May 1898 – 9 June 1979) was a British physician and researcher in cancer at the University of Leeds, and consultant at St James’s Hospital.

She developed strains of inbred mice and led early investigations into whether chemicals used in the dyeing industry caused bladder cancer.

Following her retirement in 1963, she continued to be involved at her university's cancer research centre and in the breast clinic at Leeds General Infirmary.

[3] Following an appointment as Manchester Royal Infirmary's first woman house surgeon, though discouraged from pursuing a surgical career, Bonser took up a post as anatomy demonstrator under John Stopford.

[1][3] In 1923, the year after joining the British Medical Association (BMA), she gained her MD with distinction, and became president of the women's union at Manchester University.

[1] She persuaded Passey to use strains of inbred mice to investigate carcinogenic effects of soot in York's blast furnace workers.

[3][8] To this, Bonser responded:[3][9] No-one would deny that Mendelian laws are as applicable to the human as to the tall and short peas which Mendel used in his original experiments.

[3] In 1942, after the department of cancer research closed, Bonser was appointed morbid anatomist to Pontefract General Hospital.

[19][20] In addition to several lectures Bonser delivered in the United States, in 1956 the Indian Government invited her to address Mumbai's Cancer Research Centre.

[2] The following year the Ministry of Health chose her to sit on their committee that looked at the risk of cancers from food additives and preservatives.

[10] Following her retirement in 1963, Bonser continued to be involved at her university's cancer research centre and the breast clinic in Leeds General Infirmary.