Archbishop Mar Jacques Ishaq (born February 25, 1938) is a Catholic cleric who formerly served as Curial Bishop of the Patriarchate of Babylon, Iraq, of the Chaldean Catholic Church. He served as locum tenens of the Patriarch of Babylon of the Chaldeans between the retirement of Emmanuel III Delly in December 2012 and the election of Louis Raphaël I Sako in January 2013.