The de Havilland Firestreak is a British first-generation, passive infrared homing air-to-air missile. It was developed by de Havilland (later Hawker Siddeley) in the early 1950s and was the first such weapon to enter active service with the Royal Air Force and Fleet Air Arm, equipping the English Electric Lightning, de Havilland Sea Vixen and Gloster Javelin. It was a rear-aspect, fire and forget pursuit weapon, with a field of attack of 20 degrees either side of the target and was partially replaced in service by a developed variant, the Hawker Siddeley Red Top.