The Idiot (Russian: Идио́т, Idiot) is a novel by the 19th-century Russian author Fyodor Dostoyevsky. It was first published serially in the journal The Russian Messenger in 1868–9.

The title is an ironic reference to the central character of the novel, Prince (Knyaz) Lev Nikolaevich Myshkin, a young man whose goodness and open-hearted simplicity lead many of the more worldly characters he encounters to mistakenly assume that he lacks intelligence and insight. In the character of Prince Myshkin, Dostoevsky set himself the task of depicting "the positively good and beautiful man".