The Well of Loneliness is a lesbian novel by British author Radclyffe Hall that was first published in 1928. It follows the life of Stephen Gordon, an Englishwoman from an upper-class family whose "sexual inversion" (homosexuality) is apparent from an early age.

Marguerite Antonia Radclyffe Hall (12 August 1880 - 7 October 1943) was an English poet and author, best known for the novel The Well of Loneliness, a groundbreaking work in lesbian literature. In adulthood, Hall often went by the name John, rather than Marguerite.