Lloyd Blaine Hammond Jr. (born January 16, 1952) is a Gulfstream test pilot, a former United States Air Force officer, and a former NASA astronaut.

He attended the Empire Test Pilots' School (ETPS) at Aeroplane and Armament Experimental Establishment (A&AEE) Boscombe Down, United Kingdom, in 1981.

As a test pilot school instructor, he flew the F-4, A-7 Corsair II, and A-37, and was the High Angle of Attack program monitor, teaching stall/spin theory and flight training.

He was also assigned as an Astronaut Support Person (ASP), or "Cape Crusader," responsible for monitoring Orbiter status as it undergoes testing and maintenance at John F. Kennedy Space Center during preparations for the next flight.

Hammond was the lead astronaut supporting Orbiter software development and changes, including the Global Positioning System (GPS) avionics upgrade.

The seven-man crew performed numerous scientific experiments to collect data on atmospheric infrared and ultraviolet phenomena including a deploy and rendezvous in support of the Strategic Defense Initiative Office (SDIO).