John Kaloktenes was a 12th-century Byzantine metropolitan who served the city of Thebes. Born in Constantinople to noble parents, Constantine and Maria, he originally lived as a monk in a local monastery. Following his appointment by Patriarch Luke Chrysoberges in 1166, he took on significant ecclesiastical responsibilities, including the filling of five vacant bishoprics. He is widely remembered for his extensive charitable activities and his commitment to public works, which greatly benefited the local population during his tenure.