Mary Elizabeth Braddon (4 October 1835 – 4 February 1915) was an English popular novelist of the Victorian era. She is best known for her 1862 sensation novel Lady Audley's Secret.
Born in London, Mary Elizabeth Braddon was privately educated. Her mother Fanny separated from her father Henry in 1840, when Mary was five. When Mary was ten years old, her brother Edward Braddon left for India and later Australia, where he became Premier of Tasmania. Mary worked as an actress for three years when she was befriended by Clara and Adelaide Biddle. They were only playing minor roles but Braddon was able to support herself and her mother. Adelaide noted that Braddon's interest in acting waned as she took an interest in writing novels.
In 1860, Mary met John Maxwell (1824–1895), a publisher of periodicals. She started living with him in 1861. However, Maxwell was already married with five children, and his wife was living in an asylum in Ireland. Mary acted as stepmother to his children until 1874, when Maxwell's wife died and they were able to get married. She had six children by him, including the novelist William Babington Maxwell.
Braddon was a prolific writer, producing more than 80 novels with inventive plots. The most famous is Lady Audley's Secret (1862), which won her recognition, and a fortune as a bestseller. It has remained in print since its publication and been dramatised and filmed several times. R. D. Blackmore's anonymous sensation novel Clara Vaughan (1864) was wrongly attributed to her by some critics.
Braddon wrote several works of supernatural fiction, including the pact with the devil story Gerald, or the World, the Flesh and the Devil (1891), and the ghost stories "The Cold Embrace", "Eveline's Visitant" and "At Chrighton Abbey". From the 1930s onwards, these stories were often anthologised in collections such as Montague Summers's The Supernatural Omnibus (1931) and Fifty Years of Ghost Stories (1935). Braddon's legacy is tied to the sensation fiction of the 1860s.