Sir Thomas Gresham (c. 1519 – 21 November 1579), Thomas Gresham the Elder, was an English merchant and financier who acted on behalf of King Edward VI (1547-1553) and Edward's half-sisters, queens Mary I (1553-1558) and Elizabeth I (1558-1603).
In 1565 Gresham founded the Royal Exchange in the City of London.