Lord Alfred Bruce Douglas (October 22, 1870 – March 20, 1945), nicknamed Bosie, was a British author, poet and translator, better known as the intimate friend and lover of the writer Oscar Wilde. Much of his early poetry was Uranian in theme, though he tended, later in life, to distance himself from both Wilde's influence and his own role as a Uranian poet.

Douglas was born at Ham Hill House in Worcestershire. He was educated at Winchester College (1884–88) and at Magdalen College, Oxford (1889–93), which he left without obtaining a degree. In 1891, Douglas met Oscar Wilde; although the playwright was married with two sons, they soon began an affair. After Wilde's death, Douglas established a close friendship with Olive Eleanor Custance, an heiress and poet. They married on 4 March 1902 and had one son, Raymond Wilfred Sholto Douglas.

Throughout the 1930s and until his death, Douglas maintained correspondences with many people, including Marie Stopes and George Bernard Shaw. Anthony Wynn wrote the play Bernard and Bosie: A Most Unlikely Friendship based on the letters between Shaw and Douglas. One of Douglas's final public appearances was his well-received lecture to the Royal Society of Literature on September 2, 1943, entitled The Principles of Poetry, which was published in an edition of 1,000 copies.

Douglas published several volumes of poetry; two books about his relationship with Wilde, Oscar Wilde and Myself (1914; largely ghostwritten by T.W.H. Crosland, the assistant editor of The Academy and later repudiated by Douglas), Oscar Wilde: A Summing Up (1940); and a memoir, The Autobiography of Lord Alfred Douglas (1931).  Douglas also was the editor of a literary journal, The Academy, from 1907 to 1910, and during this time he had an affair with artist Romaine Brooks.