Kolosh Glacier (Bulgarian: ледник Колош|lednik Kolosh, in Bulgarian pronounced as /ˈlɛdnik ˈkɔɫoʃ/) is the 6.7 km long and 3.6 km wide glacier on Magnier Peninsula, Graham Coast on the west side of Antarctic Peninsula, situated south of Nesla Glacier. It drains the west slopes of Lisiya Ridge north of Mount Bigo, and flows northwestwards into Bigo Bay next south of the terminus of Nesla Glacier.
The glacier is named after Kolosh Peak in Konyavska Mountain, Western Bulgaria.
Kolosh Glacier is centred at -65.7472°N -64.3083°W. British mapping in 1971.