Oplontis was a town near Pompeii, in the Roman Empire. On August 24, AD 79, the eruption of Mount Vesuvius buried it under a deep layer of ash. It is today the location of the Villa Poppaea, the villa possibly associated with the second wife of Emperor Nero, which continues to be excavated was excavated in the mid-20th century and is open to the public.
A second villa, the Villa of L. Crassius Tertius, was discovered in 1974, 300 metres east of the Villa of Poppaea, during the construction of a school. It was named following the finding of a bronze seal bearing Crassius' name.
The name "Oplontis" most likely refers to the baths in the area of Oncino, but today the name commonly covers the group of villas in the middle of the modern town of Torre Annunziata, also known as Torre Nunziata in the local Neapolitan dialect.
A large number of artifacts from Oplontis are preserved in the Naples National Archaeological Museum