HMS Cossack (R99) was a British destroyer of the Royal Navy, launched in 1944. She was part of the C-class of destroyers and played a significant role during World War II, participating in various naval operations. Cossack was known for her speed and agility, making her effective in anti-submarine warfare. After the war, Cossack continued to serve in the Royal Navy until she was decommissioned in 1956. She was eventually sold for scrap in 1972. Throughout her service, she earned a reputation for her resilience and capability in challenging maritime environments.