Diocletian was a Roman emperor who ruled from 284–305 AD.
Diocletian may also refer to:
Architecture Aqueduct of Diocletian, a Roman aqueduct near Split, Croatia Baths of Diocletian, a bath complex in Rome, Italy Camp of Diocletian, a military complex at Palmyra, Syria Diocletian's Palace, an ancient fortress which forms the core of the modern town of Split, Croatia Diocletian window, large windows characteristic of Ancient Roman bath complexes
Other uses Diocletian (band), a war metal band from New Zealand Dioclesian, a tragicomic semi-opera by Henry Purcell
See also Diocletianopolis (disambiguation)