Stephen Grellet (2 November 1773 – 16 November 1855) was a prominent French-born American Quaker missionary.He was born Étienne de Grellet du Mabillier in Limoges, the son of a counsellor of King Louis XVI. Raised as a Roman Catholic he was educated at the Military College of Lyons, now the Institut d'études politiques de Lyon, and at the age of 17 he entered the personal guard of the king.