ORP Orkan, formerly HMS Myrmidon, was an M-class destroyer of the Polish Navy during World War II.

The sinking of Orkan was the biggest life loss of Polish Navy resulting from a single incident in its entire history.

The ships carried a maximum of 567 long tons (576 t) of fuel oil that gave them a range of 5,500 nautical miles (10,200 km; 6,300 mi) at 15 knots (28 km/h; 17 mph).

She was originally commissioned into the Royal Navy as HMS Myrmidon and was funded by St Helens as the result of the Warships Week National Savings campaign.

The sinking of Orkan was the biggest life loss of Polish Navy resulting from a single incident in its entire history.