Sirma Glacier (Bulgarian: ледник Сирма, ‘Lednik Sirma’ \'led-nik 'sir-ma\) is the 7 km long and 4 km wide glacier on the west side of Owen Ridge in southern Sentinel Range, Ellsworth Mountains in Antarctica, situated south of Bolgrad Glacier, and flowing west-southwestwards from Mount Southwick, Mount Milton and Mount Inderbitzen to leave the range and join Nimitz Glacier northwest of Modren Peak.