Aurora Floyd is a sensation novel by Mary Elizabeth Braddon published on 1 January 1863. It is thematically similar to her highly popular novel Lady Audley's Secret (1862).

Aurora Floyd is the spoiled but kind-hearted daughter of Archibald Floyd, a wealthy banker, and his wife, an actress who died shortly after Aurora's birth. At 17, she is sent to a Parisian finishing school and returns to her home, Felden Woods in Kent, after 15 months. At her 19th birthday ball, she meets Captain Talbot Bulstrode, a proud Cornish baron's son, and eventually falls in love with him. John Mellish, an old school friend of Talbot, also becomes enamored with Aurora, creating a rivalry between the two men. Talbot proposes, is initially rejected, but after reviving Aurora from a faint, they become engaged. However, Talbot later learns that Aurora ran away from school shortly after arriving and refuses to explain her actions, leading him to end the engagement despite still loving her.

After the end of her engagement, Aurora falls ill for several months. During this time, John Mellish, who has become a favourite of her father, proposes again, and Aurora accepts. They marry and move to Mellish Park. Aurora encounters Stephen Hargraves, a former stable hand with a troubled past, and has him dismissed after he mistreats her dog. Later, James Conyers, a man connected to Aurora's past, arrives at Mellish Park. Conyers is subsequently found dead, revealing that Aurora had previously married him after running away from school, which temporarily renders her marriage to John invalid. Seeking guidance from Talbot Bulstrode, Aurora and John are legally remarried. Rumours of her connection to Conyers spread, causing tension, but the truth about the murder weapon is revealed, and John and Aurora are ultimately reunited.

A Scotland Yard detective, Joseph Grimstone comes to Mellish Park to investigate and finds clues which point to Hargraves as the murderer, but Grimstone is unable to find proof. Out walking one night by the lodge where Conyers was staying, Talbot sees a dim light inside and goes to investigate. He finds Hargraves who has returned to the lodge to retrieve the £2,000 that he took from Conyers after murdering him. After a struggle, Hargraves is subdued and, after confessing his crime, is eventually hanged.

Aurora Floyd was first serialised in London's monthly Temple Bar magazine between January 1862 and January 1863; its success "caused an unprecedented run on the magazine". It was then published in 1863 in three volumes by William Tinsley. This was only a few months after the publication of Mary Elizabeth Braddon's other famous novel, Lady Audley's Secret, which was published in October 1862. The two novels not only helped to establish a literary genre but made Braddon a fortune, with which she purchased a stately home.

When the three volume set was published in 1863, the publishers announced her name for the first time as 'Mary Elizabeth Braddon' rather than the gender-neutral M.E. Braddon. The first single-volume edition of the text appeared at the end of 1863.

One of the inspirations for the eponymous Aurora Floyd was Catherine Walters, also known as "Skittles", an infamous high-class courtesan who made her debut in 1861. She became known for riding along Hyde Park in a pony carriage. Within the novel, Aurora Floyd is frequently described as donning a pork pie hat and having an affection for the stables, both traits which would have brought Catherine Walters to the mind of the Victorian reading public.

Aurora Floyd is considered one of the pioneers of the sensation novel genre, containing as it does a sense of realism within its domestication of criminality. The rise of this genre concerned many conservative critics, who believed that it might represent the normalisation of vice within the middle classes, and an enthusiasm for the lurid and gruesome within published entertainment.