Roxana: The Fortunate Mistress (full title: The Fortunate Mistress: Or, A History of the Life and Vast Variety of Fortunes of Mademoiselle de Beleau, Afterwards Called the Countess de Wintselsheim, in Germany, Being the Person known by the Name of the Lady Roxana, in the Time of King Charles II) is a 1724 novel by Daniel Defoe.