HDMS Nordkaperen (S321) was a Narhvalen-class submarine of the Royal Danish Navy.

She was built to the German Type 205 design at the naval dockyard in Copenhagen where she was laid down on 4 March 1966.

In 1994, Nordkaperen and sister ship Narhvalen were modified to bring their technical performance more in line with the Royal Danish Navy's newer Tumleren class.

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