The Lodger is a novel by English author Marie Adelaide Belloc Lowndes. The short story was first published in the January, 1911 edition of McClure's Magazine, in 1911. Belloc Lowndes wrote a longer version of the story, which was published as a series in the Daily Telegraph in 1913 with the same name. Later that year, the novel was published in its entirety by Methuen Publishing.

Marie Adelaide Elizabeth Rayner Lowndes, who wrote as Marie Belloc Lowndes, was a prolific English novelist, and sister of author Hilaire Belloc.