HSwMS Hajen (Hj), (Swedish for "The shark") was the lead boat of the Hajen-class submarine of the Swedish Navy.[1]
HSwMS Hajen was launched on 11 December 1954 by Saab Kockums, Malmö and commissioned on 28 February 1957.
She was decommissioned on 1 July 1980 and later scrapped in Landskrona in 1983.[2]