Eupsychius of Caesaria was a 4th-century Christian martyr from Cappadocia. A nobleman who had recently married, he was executed in 362 during the reign of Emperor Julian the Apostate. His death followed the destruction of a local pagan temple dedicated to Tyche, an event that provoked the emperor's anger toward the Christian population of Caesarea. Because of his involvement in the temple's demolition, Eupsychius was targeted during a period of persecution aimed at restoring pagan traditions in the region.