Demons is a novel by Fyodor Dostoevsky, first published in the journal The Russian Messenger in 1871–72. It is considered one of the four masterworks written by Dostoevsky after his return from Siberian exile, along with Crime and Punishment (1866), The Idiot (1869), and The Brothers Karamazov (1880). Demons is a social and political satire, a psychological drama, and large-scale tragedy. Joyce Carol Oates has described it as "Dostoevsky's most confused and violent novel, and his most satisfactorily 'tragic' work." According to Ronald Hingley, it is Dostoevsky's "greatest onslaught on Nihilism", and "one of humanity's most impressive achievements—perhaps even its supreme achievement—in the art of prose fiction."

Fyodor Mikhailovich Dostoevsky, sometimes transliterated as Dostoyevsky, was a Russian novelist, short story writer, essayist and journalist. Numerous literary critics regard him as one of the greatest novelists in all of world literature, as many of his works are considered highly influential masterpieces.