Sinion Glacier (Bulgarian: ледник Синион, ‘Lednik Sinion’ \'led-nik si-ni-'on\) is the 6 km long and 3 km wide glacier on Nordenskjöld Coast in Graham Land situated southwest of Zaychar Glacier and north of Akaga Glacier. It drains the southeast slopes of Detroit Plateau, and flows east-southeastwards along the south slopes of Kableshkov Ridge to enter Odrin Bay in Weddell Sea. The feature is named after the Bulgar ruler Sinion (6th century).
Sinion Glacier is located at 64°32′40″S 60°26′50″W / 64.54444°S 60.44722°WCoordinates: 64°32′40″S 60°26′50″W / 64.54444°S 60.44722°W. British mapping in 1978.