Advice to a desolate France, in full Advice to a desolate France, in which the cause of the present war and the remedy that could be applied are shown, and primarily advises whether one should force consciences, (in French: Conseil à la France désolée, auquel est monstré la cause de la guerre présente et le remède qui y pourroit estre mis, et principalement est avisé si on doit forcer les consciences) is a pamphlet published anonymously by Sebastian Castellio in 1562.

Although the work, like the Treatise on Heretics, did not succeed in preventing the French Wars of Religion, it remains one of the earliest texts to defend religious freedom in the modern era.

[2] This opposition reached its peak with the execution of Michael Servetus, a Protestant theologian perceived as heterodox, who was burned at the stake in Geneva.

[5] The central aspect of the work aimed to address both Protestants and Catholics, criticized the violence between the two parties, and called for a return to "reason".

[9] Unlike the Treatise on Heretics, which primarily targeted John Calvin, here the author refocused and also attacked the fanaticism displayed by some Catholics.