Callinicus I of Constantinople was a 7th-century prelate who served as the Ecumenical Patriarch of Constantinople between 693 and 705. During his tenure, he played a significant political role by assisting in the removal of Emperor Justinian II, which allowed Leontius to ascend the Byzantine throne. Following the eventual return of Justinian II to power, Callinicus faced severe retaliation, resulting in his arrest, blinding, and subsequent imprisonment within a monastery.