HSwMS Illern (In), (Swedish for "The polecat") was the fourth Hajen-class submarine of the Swedish Navy.

[1] HSwMS Illern was launched on 14 November 1957 by Saab Kockums, Karlskrona and commissioned on 31 August 1959.

She was decommissioned in 1980 and later sold for scrap in Odense in 1981.

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