Stadium of Antoninus Pius, Archaeological site in Pozzuoli, Italy.

The Stadium of Antoninus Pius is a Roman stadium in Pozzuoli with a rectangular plan, one short side curved and the other, where athletes started, slightly curved, opening onto a monumental archway of piperno stone. The cavea was divided into ima, media and summa sections; two rows of piperno seats of the ima cavea survive beside the track. The modern Via Domiziana, built in 1932, cut the monument lengthwise.

Antoninus Pius built the stadium to honour the philhellenic spirit of his predecessor Hadrian, near one of Cicero's villas, where Hadrian was first buried after dying at Baia. The Eusebeia games held there combined athletic and musical contests. Use continued until the early 4th century AD, when Theodosius' edicts ended it; a flood then buried much of the structure, and the Monte Nuovo eruption of 1538 covered the rest until excavations in 2008.

Antoninus Pius staged Greek-style games here called Eusebeia, split into an athletic competition and a musical one, in honour of his philhellene predecessor Hadrian. The stadium was used until the early 4th century AD, when it was abandoned after the edicts of Theodosius.

Access is through Via Campi Flegrei, and it is best to contact the management office at +39-081-526-6007 to ask about current conditions and visiting arrangements. The site is outdoors, so bring sun protection and wear appropriate shoes for uneven ground.

The monumental athletes' entrance was rebuilt after excavation: only the piers of its double arcade of piperno arches survived intact, and the fallen blocks were repositioned on a steel frame. The track itself was plain beaten earth, renewed at least three times.