The Sleeping Ariadne, housed in the Vatican Museums in Vatican City, is a Roman Hadrianic copy of a Hellenistic sculpture of the Pergamene school of the 2nd century BC, and is one of the most renowned sculptures of Antiquity. The reclining figure in a chiton bound under her breasts half lies, half sits, her extended legs crossed at the calves, her head pillowed on her left arm, her right thrown over her head. Other Roman copies of this model exist: one, the "Wilton House Ariadne", is substantially unrestored, while another, the "Medici Ariadne" found in Rome, has been "seriously reworked in modern times", according to Brunilde Sismondo Ridgway. Two surviving statuettes attest to a Roman trade in reductions of this familiar figure. A variant Sleeping Ariadne is in the Prado Museum, Madrid. A later Roman variant found in the Villa Borghese gardens, Rome, is at the Louvre Museum.
Purchased from the Roman Angelo Maffei in 1512 by Pope Julius II, it was immediately installed in the Belvedere Courtyard, which links the Vatican Palace with the papal casina called the Belvedere; there its neighbors were the recently discovered Laocoön and the Belvedere Apollo.