HSwMS Delfinen (De), was the fourth boat of the Draken-class submarine of the Swedish Navy.

[1] HSwMS Delfinen was launched on 7 March 1961 by Saab Kockums, Malmö and commissioned on 7 June 1962.

She was decommissioned in 1989 and scrapped later in Gävle in 1993.

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