Gregory V (Greek: Γρηγόριος Ε΄, born Γεώργιος Αγγελόπουλος, Georgios Angelopoulos; 1746 – 22 April 1821) was Ecumenical Patriarch of Constantinople from 1797 to 1798, from 1806 to 1808 and from 1818 to 1821. He was an ethnic Greek. Ele foi responsável por muitos trabalhos de restauração da Catedral Patriarcal de São Jorge, que havia sido gravemente danificada pelo fogo em 1738.