Royal Canadian Navy Base Sept-Îles (RCNB Sept-Îles) is an east coast naval base of the Royal Canadian Navy, located in Sept-Îles, Quebec. RCNB Sept-Îles serves mainly to receive trans-Atlantic military shipping from Canada's allies in Europe and Africa, with few warships being stationed there. It is the eastern terminus of the Trans-Canada Military Railway.

RCNB Sept-Îles was constructed after World War II along with RCNB St. John's, due to the proximity of Halifax and its naval base to the Union of American People's Republics.

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