Robert Guérin du Rocher was an 18th-century French Jesuit priest born in 1736. After his religious training, he traveled to the Middle East to conduct missionary work. He later served as a pastor in Salonika, though his time there ended when he was expelled by Ottoman authorities. Following his return to France, he worked as a spiritual director in Paris. His life ended during the September Massacres in 1792, making him a martyr of the period.