Patriarch Gregory of Constantinople may refer to:
Gregory I of Constantinople, Patriarch in 379–381 Gregory II of Constantinople, Ecumenical Patriarch of Constantinople in 1283–1289 Gregory III of Constantinople, Ecumenical Patriarch of Constantinople in 1443–1450 Gregory IV of Constantinople, Ecumenical Patriarch of Constantinople in 1623 Gregory V of Constantinople, Ecumenical Patriarch of Constantinople in 1797–1798, 1806–1808 and 1818–1821 Gregory VI of Constantinople, Ecumenical Patriarch of Constantinople in 1835–1840 Gregory VII of Constantinople, Ecumenical Patriarch of Constantinople in 1923–1924