Uncle Silas is a Victorian Gothic mystery/thriller novel by the Anglo-Irish writer J. Sheridan Le Fanu. It is not a novel of the supernatural (despite a few creepily ambiguous touches), but does show a strong interest in the occult and in the ideas of Swedenborg. Like many of Le Fanu's novels, it grew out of an earlier short story, "A Passage in the Secret History of an Irish Countess" (1839).