Dionysius of Alexandria, known as Dionysius Periegetes (the Voyager), was a Greek didactic poet who flourished in the 2nd century CE, likely during the reign of the emperor Hadrian. He is identified as being from Alexandria, but no further biographical details are recorded.

His sole surviving work is the Periegesis of the Inhabited World, a hexameter poem that systematically describes the known world. Dionysius’s Periegesis was a widely influential geographical summary in verse and served as a standard school text for centuries. Its enduring educational role ensured its survival and prompted both a Latin translation by the grammarian Priscian around 500 CE and later Byzantine commentaries. The poem was instrumental in transmitting classical geographical knowledge into the Middle Ages and the Renaissance.