John Strettell (1721–1786) of London, England, was one of the most important merchants providing trade goods to the Canadian fur trade in the period between the Conquest of Canada and his death in 1786.
Born in 1721, he was the second son of Robert Strettell, a London merchant and Quaker. Robert Strettell took most of his family to Philadelphia, Pennsylvania, where he was successful in business and became Mayor of Philadelphia. John remained in England, and was trained in business by his mother's brother, the merchant John Owen.