Auguste Gabriel Maurice Raynaud (10 August 1834 – 29 June 1881) was the French medical doctor who discovered Raynaud syndrome, a vasospastic disorder which contracts blood vessels in extremities and is the "R" in the CREST syndrome acronym, in the late 19th century.

[2] He became a holder of a Doctorat ès lettres the following year with the 48 page article "Asclepiades of Bithynia, doctor and philosopher",[3] and the book "Medicine in Molière's time".

In 1866 he became an agrégé with the works Sur les hyperhémies non phlegmasiques and De la revulsion, which established him as a professor of medical pathology.

He was made an officer of the Légion d’honneur in 1871 and elected to the Académie de Médecine in 1879, and lectured with great success at the university as well as the Lariboisière and Charité hospitals.

At the London congress, Raynaud's paper, "Scepticism in Medicine, Past and Present", was read by one of his colleagues.