RCNB Protector is a RCN naval base located next to Sydney Harbour, on Nova Scotia's Cape Breton Island. It was founded in 1940 and used by the navy during the Second World War. It was mainly used to provision, protect and repair the various merchant marine convoys to Quebec, Halifax, and the United Kingdom. It was a main combat zone during the Battle of the St. Lawrence and the more general Battle of the Atlantic.
- HMCS Merciful (SHR-01)
- HMCS Cougar (PC-61)
- HMCS Swordfish (PC-66)
- HMCS Beaver (PC-70)
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