Robert Willan FRS (12 November 1757 near Sedbergh, Yorkshire – 7 April 1812, Madeira) was an English physician and the founder of dermatology as a medical specialty. He received his MD at Edinburgh in 1780 and was elected a Fellow of the Royal Society in 1809. He was educated at Sedbergh School. From 1781 Willan practised medicine in Darlington and then moved to London in 1783 as physician to the new Carey Street Public Dispensary, where he remained until 1803 teaching alongside Thomas Bateman.
Following the example of Carolus Linnaeus, Willan attempted a taxonomic classification of skin diseases, describing impetigo, lupus, psoriasis, sceloderma, ichthyosis, sycosis, and pemphigus. Willan's portrait was reproduced on the cover of the British Journal of Dermatology for many years. Willan and Bateman working together provided the world's first attempt to classify skin diseases from an anatomical standpoint.
In 1790 Willan received the Fothergill Gold Medal from the Medical Society of London for his classification of skin diseases. In the same year he published an account entitled "A Remarkable Case of Abstinence", which detailed the case of a young Englishman who died in 1786 after fasting for 78 days - one of the earliest accounts of eating disorders in males.
A copy of one of his works was translated into German and published in Breslau in 1799. The English version has been lost.
In 1798 Willan described the occupational disease psoriasis diffusa, which affects the hands and arms of bakers, and in 1799 first described the exanthematous rash of childhood known as erythema infectiosum.
Willan's 1808 book, On Cutaneous Diseases is a landmark in the history of dermatology and in medical illustration and contains the first use of the word "lupus" to describe cutaneous tuberculosis..
- NNDB 
- Fagge, C. Hilton. On Disease of the Skin by Ferdinand Hebra, N.D. The New Sydenham Society, London.
- Site to view online Delineations of Cutaneous Diseases: Exhibiting the Characteristic Appearances of the Principal Genera and Species Comprised in the Classification of the Late Dr. Willan; and Completing the Series of Engravings Begun by that Author by Thomas Bateman, London, 1817.
- Robert Willan, M D, Observations on the Sulphur-Water, at Croft, Near Darlington 
- Evans, A. S. and Kaslow, R. A. (1997). Viral Infections of Humans. Springer. ISBN 0-306-44856-4
- Lee, H. S. J. (Ed.). (2002). Dates in Infectious Diseases: A Chronological Record of Progress in Infectious Diseases Over the Last Millennium. Taylor & Francis. ISBN 1-84214-150-3
- Levere, T., Turner L'E, G. (2002). Discussing Chemistry and Steam: The Minutes of a Coffee House Philosophical Society 1780-1787. Oxford: Oxford University Press. ISBN 0-19-851530-8
- Porter, R. and Bynum, W. F. (Eds.).(2002). William Hunter and the Eighteenth-Century Medical World. Cambridge: Cambridge University Press. ISBN 0-521-52517-9
- Sebastian, A. (2000). Dates in Medicine. Taylor and Francis. ISBN 1-85070-095-8
- Silverman, J. A. (1990). Anorexia Nervosa in the Male: Early Historic Cases. In Andersen, A. E. (Ed.). Males with Eating Disorders (pp. 3-8). ISBN 0-87630-556-7
- On Cutaneous Diseases - Interactive text
- Robert Willan's Description and Treatment of Cutaneous Diseases 1797/1798 A Bicentennial