Quintus Tineius Demetrius was a Roman eques who is known to have held imperial appointments during the reign of the Emperor Commodus.
He is known from inscriptions and surviving documents written on papyrus.
[1] His primary concern as governor of Egypt was to safeguard the harvest and delivery of grain to the populace of Rome, but surviving documents from his administration show his responsibilities extended further.
Foremost was the processing of the provincial census (apographa), which was held once every 14 years.
[2] Letters survive Demetrius wrote to one Dioskoros concerning shortages in a granary, possibly the one at Karanis.