Fergus, a novel by Northern Irish-Canadian writer Brian Moore, was published in 1970, in the United States by Holt, Rinehart and Winston.

It tells the story of Fergus Fadden, a 39-year-old Irish-born writer living in California, who is haunted by ghosts from his past, including that of his father.

[1] Moore's biographer, Patricia Craig, described it as "wholly original, and singularly diverting".

[2] Jo O'Donoghue says that, in Fergus, "Moore carries the theme of family influence to an extreme conclusion".

[3] George Woodcock, reviewing the novel for the quarterly journal Canadian Literature, said: "Fergus's nightmare is never less than convincing.