Arianzus or Arianzos () was a town of ancient Cappadocia, inhabited in Byzantine times. Arianzus is a titular see of the Ecumenical Patriarchate of Constantinople. Gregory of Nazianzus was born in Arianzus.Gregorius Nazianzenus, A Dictionary of Greek and Roman biography and mythology William Smith, Ed.

Its site is located near the Sivrihisar settlement in Güzelyurt, Asiatic Turkey.

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