HMS Cossack (R99) was a British destroyer launched in 1944, part of the Royal Navy. She was the lead ship of the C-class destroyers, designed for anti-submarine warfare and escort duties during World War II. Cossack was equipped with advanced radar and weaponry for her time, making her a vital asset in naval operations. Throughout her service, Cossack participated in various missions, including the D-Day landings in 1944. She was known for her speed and agility, allowing her to effectively engage enemy submarines and protect Allied shipping routes. Cossack was decommissioned in 1957 and later scrapped.