| Jules Cotard | |
| Birth Date: | 1 June 1840 |
| Birth Place: | Issoudun, Indre |
| Death Place: | Vanves, Seine-et-Oise |
| Nationality: | French |
| Field: | neurology and psychiatry |
| Work Institutions: | Hospice de la Salpêtrière |
| Known For: | Cotard delusion |
Jules Cotard (1 June 1840 - 19 August 1889) was a French physician who practiced neurology and psychiatry. He is best known for first describing the Cotard delusion, a patient's delusional belief that they are dead, do not exist, or do not have bodily organs.
He studied medicine in Paris and later went on to work as an intern at Hospice de la Salpêtrière, where he worked for, among others, Jean-Martin Charcot.
Cotard became particularly interested in cerebrovascular accidents (commonly known as 'strokes') and their consequences and undertook autopsies to better understand how these affected the brain. In 1869, Cotard left Salpêtrière, and at the outbreak of the Franco-Prussian War, he joined an infantry regiment as a regimental surgeon. Cotard moved to the town of Vanves in 1874, where he remained for the last 15 years of his life. He made particular contributions to the understanding of diabetes and delusions. In August 1889, Cotard's daughter contracted diphtheria and he reportedly refused to leave her bedside for 15 days until she recovered. He eventually contracted diphtheria himself and died on 19 August.
Jules Cotard served as the real-life model for the character of Dr. Cottard in the Marcel Proust novel In Search of Lost Time.
In the film Synecdoche, New York, protagonist Caden Cotard is a reference to the Cotard Delusion.