Safran Landing Systems, formerly Messier-Bugatti-Dowty, is a French company involved in the design, development, manufacture and customer support of all types of aircraft landing gear, wheels and brakes and a wholly owned subsidiary of Safran SA. It is the world's largest manufacturer of aircraft landing gear.

Landing gear is the undercarriage of an aircraft or spacecraft that is used for taxiing, takeoff or landing. For aircraft it is generally needed for both. It was also formerly called alighting gear by some manufacturers, such as the Glenn L. Martin Company. For aircraft, Stinton makes the terminology distinction undercarriage (British) = landing gear (US).