Rennick Bay is an embayment of the coastline of Antarctica at the terminus of Rennick Glacier. It is bounded on the west and east by Belousov Point and Stuhlinger Ice Piedmont.

Rennick Glacier is broad glacier, nearly 200 nautical miles long, which is one of the largest in Antarctica. It rises on the polar plateau westward of Mesa Range and is 20 to 30 nautical miles wide, narrowing to 10 nautical miles near the coast. It takes its name from Rennick Bay where the glacier reaches the sea.