| Type: | patriarch |
| Papa Eftim II | |
| Turkish Orthodox Patriarch and Archbishop of Istanbul | |
| Church: | Turkish Orthodox Church |
| See: | Istanbul |
| Term: | 1962 – 1991 |
| Predecessor: | Papa Eftim I |
| Successor: | Papa Eftim III |
| Ordination: | 1937 |
| Consecration: | 1961 |
| Consecrated By: | Papa Eftim I |
| Birth Name: | Turgut Erenerol |
| Birth Date: | 1920 |
| Birth Place: | Ankara, Ottoman Empire |
| Death Date: | 9 May 1991 |
| Death Place: | Istanbul, Turkey |
| Profession: | Theologian, Physician |
| Nationality: | Turkish |
| Religion: | Eastern Orthodox Church |
| Alma Mater: | Istanbul University |
Papa Eftim II (born Yiorghos Karahisarithis (Greek, Modern (1453-);: Γιώργος Καραχισαρίδης), later changed to Turgut Erenerol; 1920, Ankara – 1991, Istanbul) was the elder son of Papa Eftim I, the founder of the Autocephalous Turkish Orthodox Patriarchate, an unrecognised Orthodox Christian denomination, with strong influences from Turkish nationalist ideology.
Karahisarithis was a doctor of medicine by profession. He became patriarch after Papa Eftim I resigned in 1962 due to ill health. While his father survived until 14 March 1968, Eftim II took over office ruling from 1962 until his death on 9 May 1991. He was succeeded by his younger brother Papa Eftim III.