Christianity Unveiled, or Examination of the Principles and Effects of the Christian Religion (Le christianisme dévoilé, ou Examen des principes et des effets de la religion chrétienne) is an anti-Christian book attributed to Baron d'Holbach, probably published in 1766 under a pseudonym in Nancy.
In his first religiously critical work, Holbach points out aspects of the Christian faith that he considers contradictory, and particularly criticizes the moral and political influence of the Christian religion and its clergy in harsh terms. The assertions presented find numerous parallels in Holbach's later works, yet contain only latent atheistic statements and primarily attack Christianity in contrast to religion in general.
Unlike earlier critical publications on religion, Le christianisme dévoilé does not contain an analysis of the historical origin of religions or the project of a deistic alternative religion, but openly presents itself as an anti-Christian propaganda script. The book provoked lively reactions in philosophical-Enlightenment circles and was immediately confiscated by the French authorities after its publication.