François Annat (1590 – 14 June 1670) was a French Jesuit, theologian, writer, and one of the foremost opponents of Jansenism.
In 1654 he was sent to the court as confessor of Louis XIV, and, after the faithful discharge of the duties of his office, he felt compelled to resign, owing to the King's extramarital relationship with Louise de la Vallière.
He became known to the academic world in 1632, by a publication of a defense of the Jesuit doctrine of divine grace against the Oratorian Gibieuf.
In 1644 he began a series of more lengthy contributions of the famous controversy that sought to reconcile human freedom with divine efficacious grace.
He was prominent in defending Catholic orthodoxy against the attacks of the Port-Royal theologians, and in consequence came to the notice of Pascal, who directed the last of the Provincial Letters against Annat.