What is the title of Oscar Wilde's only novel?

The Picture of Dorian Gray: The Picture of Dorian Gray is a philosophical/moral fantasy novel by Oscar Wilde.
A shorter novella-length version was published in the July 1890 issue of the American periodical Lippincott's Monthly Magazine.

Oscar Wilde (1856-1900) :
He was a poet,novelist and dramatist. This Irish born poet became London’s most popular playwright in the early 1890s. His full name was Oscar Fingal O’Flahertie Wills Wilde.
Oscar Wilde’s literary reputation rests largely on his novel.
- The Picture of Dorian Gray (1891)
- Lady Windermere’s Fan (1892)
- The Importance of Being Earnest (1895).

Source: Britannica.com