Addai Scher (Syriac: ??? ????, IPA: [?adð'ða?j ?e?r]) Also written Addai Sher, Addaï Scher and Addai Sheir (3 March 1867 – 21 June 1915), an ethnic Assyrian, was the Chaldean Catholic archbishop of Siirt in Upper Mesopotamia.
He was killed by the Ottomans during the 1915 Assyrian Genocide.