Francis Turretin (17 October 1623 – 28 September 1687; also known as François Turretini and Francis Turrettin) was a Swiss-Italian Reformed scholastic theologian.
Turretin is especially known as a zealous opponent of the theology of the Academy of Saumur (embodied by Moise Amyraut and called Amyraldianism), as an earnest defender of the Calvinistic orthodoxy represented by the Synod of Dort, and as one of the authors of the Helvetic Consensus, which defended the formulation of predestination from the Synod of Dort and the verbal inspiration of the Bible.
He was the grandson of Francesco Turrettini, who left his native Lucca in 1574 and settled in Geneva in 1592. Francis was born to Benoit Turretin at Geneva on 17 October 1623 and died there on 28 September 1687. He studied theology at Geneva (1640-1644), Leiden (1644), Utrecht, Paris (1645-1646), Saumur (1646-1648),Montauban, and Nîmes. In Paris he also studied philosophy under Roman Catholic Pierre Gassendi. Returning to his native city, he was made pastor of the Italian church there from 1648 to 1687, of the French congregation from 1653-1687, and professor of theology at the Academy of Geneva in 1653. He is the father of Jean Alphonse Turretin, who would do much to dismantle the theology his father promoted.