HMS Westcott (D47) was a Royal Navy Admiralty W-class destroyer that served in the Second World War. In the Second World War Westcott served in an anti-submarine role and escorted numerous Atlantic and Malta convoys.

Operation Calendar was an Anglo–American operation in the Second World War to deliver 52 Supermarine Spitfire fighter aircraft to Malta in April 1942. Spitfires were necessary to challenge Axis air superiority over Malta because they had the performance that Hurricane fighters lacked. Aircraft carriers were necessary to get fighter aircraft to positions in the western Mediterranean from which they had the range to reach Malta but British aircraft carriers were busy elsewhere, under repair or too small to deliver enough Spitfires to be effective.