The Nun is a 2013 French drama film directed by Guillaume Nicloux. It is based on the 18th-century novel La Religieuse by French writer Denis Diderot. The film premiered in competition at the 63rd Berlin International Film Festival. It received two nominations at the 4th Magritte Awards, winning Best Actress for Pauline Étienne, and a nomination at the 39th César Awards. Production companies included Les Films du Worso, Belle Epoque Films and Versus Production.

La Religieuse is an 18th-century French novel by Denis Diderot. Completed in about 1780, it was first published by Friedrich Melchior Grimm in 1792 in his Correspondance littéraire in Saxony, and subsequently in 1796 in France.