Jean Hellot (20 November 1685 – 13 February 1766) was a French chemist who contributed to early studies on phosphorus and worked on applied aspects in dyeing, metallurgy, mining, and porcelain manufacture.
Hellot was born in Paris to Michel and Marie-Anne Reynaud, and was taught at home and expected to follow a career in the clergy.
He became director of the newspaper Gazette de France from 1718 to 1738 and through journalism, became a friend of many French scientists.
His first chemistry research was published in 1735 and in 1736 he became an assistant chemist at the Academie Royale des Sciences, succeeding Charles Marie de la Condamine (1701-1774).
Hellot also researched invisible inks, examined methods for extraction of phosphorus from urine, the production of ether, and the manufacture of porcelain.