Peter Sainthill may refer to:
Peter Sainthill (died 1571) (1524–1571), Member of Parliament for Grampound, and for Saltash Peter Sainthill (MP for Tiverton) (1593–1648), Member of Parliament for Tiverton in Devon Peter Sainthill (surgeon) (1698–1775), British 18th-century surgeon and Fellow of the Royal Society