ORP Jastrząb[note 1] ("Hawk") was a former S-class submarine, originally of the United States Navy, in Polish service between 1941 and 1942, when she was lost to friendly fire.

[2][dubious – discuss] Jastrząb entered the history of the Polish Navy as its only submarine ever to cross the Atlantic Ocean from the West to the East, as she came from the US to Europe.

During the passage of convoy PQ-15 to Murmansk, Jastrząb on 2 May 1942 was mistakenly engaged by the destroyer HNoMS St. Albans and the minesweeper HMS Seagull.

Others however [5][6] state she was covering PQ 15's passage by patrolling the Norwegian coast against a sortie by German capital ships, one of five submarines so assigned.

Pertek also (after Romanowski's testimony) states Jastrząb was fired upon despite showing yellow recognition smoke candles; however other sources do not confirm this.