The Bastion, also known as the Nanaimo Bastion, is an historic octagonal shaped bastion or fortification located at 98 Front Street in Nanaimo, British Columbia, Canada. The Hudson's Bay Company, which then held a royal lease on all of what was then the Colony of Vancouver Island, built it between 1853 and 1855 to defend its coal mining operations in Nanaimo. Square logs were used for the walls of the three-storey building whose third floor extends out over the lower floors.