Isaac Romilly (c.1710–1759) was an English businessman of Huguenot background, and a Fellow of the Royal Society.
He was the son of Etienne Romilly, a French migrant in London, and his wife Judith de Montsallier. His brother Peter was father of Samuel Romilly. He was in business with Samuel Fludyer and his brother Thomas.[1]
Romilly became a Fellow of the Royal Society in May 1757.[2] He died on 18 December 1759, aged 49, and was buried in St Bride's, Fleet Street.[1]