The Double: A Petersburg Poem is a novella written by Fyodor Dostoyevsky. The novella was first published on January 30, 1846 in Fatherland Notes. The Double deals with the internal psychological struggle of its main character, Yakov Petrovich Golyadkin. The motif of the novella is a doppelganger, known throughout the world in various guises such as the fetch. The Double is the most Gogolesque of Dostoyevsky's works; its subtitle "A Petersburg Poem" echoes that of Gogol's Dead Souls. Vladimir Nabokov called it a parody of "The Overcoat". The story is told in great detail with a style intensely saturated by phonetic and rhythmical expressiveness. The novella centers on a government clerk who goes mad, obsessed by the idea that a fellow clerk has usurped his identity. D.S. Mirsky characterized the story as a "painful, almost intolerable reading".

《双重人格》的主人公戈利亚德金为人正派，崇尚道义，但他自己幻想出了另一个与他长相一模一样的人——小戈利亚德金。在他的幻想中，这个人冒充自己的身份，到处招摇撞骗，还处处羞辱他，与他作对。这种病态心理搅乱了他的生活，使他精神分裂。他完全生活在自己的幻想中，试图拆穿小戈利亚德金的假冒身份和卑劣行径，维护自己的声誉，却总以失败告终。