| Professor David Thoday | |
| Birth Date: | 1883 5, df=y |
| Workplaces: | University of Cape Town University College of North Wales |
| Author Abbrev Bot: | Thoday |
| Awards: | Fellow of the Royal Society (1942)[1] |
| Children: | John Thoday |
David Thoday FRS[1] (5 May 1883 - 30 March 1964) was a botanist.
Thoday was Harry Bolus professor of botany, University of Cape Town and later professor at the University College of North Wales 1923–1949. As a botanist, his work is denoted by the author abbreviation
Thoday when citing a botanical name.[2]He was elected a Fellow of the Royal Society in 1942. His nomination reads
He married fellow botanist and activist Mary Gladys Sykes in 1910. Their son was the geneticist John Thoday.