Diocaesarea or Diocaesareia or Diokaisareia () was a Graeco-Roman town located in ancient Cappadocia near Nazianzus. According to Gregorius of Nazianzus, it was a small place. It is mentioned by Ptolemy and by Pliny the Elder.

Its site is located near Til (formerly Kaysar, reflecting the old name) in Asiatic Turkey.

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