The Idiot is a novel by the 19th-century Russian author Fyodor Dostoevsky. It was first published serially in the journal The Russian Messenger in 1868–69.

The title is an ironic reference to the central character of the novel, Lev Nikolayevich Myshkin, a young prince whose goodness, open-hearted simplicity, and guilelessness 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."The novel examines the consequences of placing such a singular individual at the centre of the conflicts, desires, passions, and egoism of worldly society, both for the man himself and for those with whom he becomes involved.The artistic method of conscientiously testing his central idea meant that the author could not always predict where the plot was going as he was writing. The novel has an awkward structure, and many critics have commented on its seemingly chaotic organization.