»The Mysterious Lodger« is a short story by L. Sheridan Le Fanu, first published in 1850.

JOSEPH SHERIDAN LE FANU [1814-1873] was an Irish mystery and horror author. He had an enormous influence on the horror genre in the 19th and 20th century, especially through his championing of tone and effect rather than shock factor. Among his most noted work is the lesbian vampire novella Carmilla [1872] and mystery Uncle Silas [1864].