Daniel Duncan (1649–1735) was a Scottish-French physician, Huguenot by religion, known as a writer of iatrochemical works.
He was orphaned when young, and he came under the guardianship of his maternal uncle, Daniel Paul, a Protestant, He was sent for his preliminary education to Puy Laurens.
Duncan then went to Montpellier to study medicine, and, after living for several years in the house of Charles Barbeyrac, took the degree of M.D.
[1] Duncan went to Paris, where he became acquainted with the minister Jean-Baptiste Colbert, by whom he was appointed physician-general to the army before Saint-Omer, commanded by the Duke of Orléans in 1677.
But, though he was appointed professor of physic and also physician to the royal household, he found the habits of the court distasteful, and the cost of living excessive; in 1703 he passed on to The Hague, where he remained for about twelve years.