The Antichrist (German: Der Antichrist) is a book by the philosopher Friedrich Nietzsche, originally published in 1895. Although it was written in 1888, its controversial content made Franz Overbeck and Heinrich Köselitz delay its publication, along with Ecce Homo. The German title can be translated into English as both "The Anti-Christ" and "The Anti-Christian".

Save for his raucous, rhapsodical autobiography, Ecce Homo, The Antichrist is the last thing that Nietzsche ever wrote, and so it may be accepted as a statement of some of his most salient ideas in their final form. Of all Nietzsche's books, The Antichrist comes nearest to conventionality in form. It presents a connected argument with very few interludes, and has a beginning, a middle and an end. The reason to listen to this version is that H.L. Mencken, the famous journalist, turned Nietzsche's German into such direct, plain-spoken American English that it puts the haranguing philosopher right up in your face.