The Low Level Bombsight, Mark III, sometimes known as the Angular Velocity Sight, was a Royal Air Force (RAF) bombsight designed for attacks by aircraft flying below 1,000 feet (300 m) altitude. It combined components of the Mark XIV bomb sight with a new mechanical computer. It featured a unique solution for timing the drop, projecting a moving display onto a reflector sight that matched the apparent motion of the target at the right instant.
The Mk. III was designed for, and mostly used by, Coastal Command aircraft in order to attack submarines. In this role, it was found to increase the chance of destroying a U-boat by 35%, and damaging it by 60%. It also saw some use in Bomber Command on the De Havilland Mosquito in the tactical role, and in a single case, on the Avro Lancaster. It remained in use in the post-war era, equipping the Avro Shackleton throughout that aircraft's lifetime until 1991.