Blue Origin, LLC is an American aerospace, space exploration company and launch service provider headquartered in Kent, Washington, United States. Blue Origin makes advanced rocket engines for United Launch Alliance and other customers as well as manufactures advanced rockets, spacecraft and heavy-lift launch vehicles. The company was selected as the second provider for lunar lander services for NASA's Artemis program and was awarded a $3.4 Billion contract. The company has three engines in production including the BE-3U, BE-3PM and BE-4. The company is working on a fourth advanced rocket engine, called the BE-7, which is still under development and when completed, will be used on planetary bodies other than Earth.

Blue Origin was founded in 2000 by Jeff Bezos, the founder and current executive chairman of Amazon. Rob Meyerson joined Blue Origin in 2003 and served as the company's president before leaving the company in 2018. The current CEO is Bob Smith.

Little is known about the company’s activities in its early years. In 2006, the company purchased land for its launch site and test facility in Texas. In November 2006, the first test vehicle was launched, the Goddard rocket, which reached an altitude of 285 feet.

The company primarily employs an incremental approach from suborbital to orbital flight, with each developmental step building on its prior work. Blue Origin moved into the orbital spaceflight technology development business in 2014, initially as a rocket engine supplier via a contractual agreement to build the BE-4 rocket engine, for major US launch system operator United Launch Alliance (ULA). ULA has said that the first flight of its Vulcan Centaur heavy-lift launch vehicle is scheduled to launch in Q3 of 2023. The heavy-lift launch vehicles main power is supported by two BE-4 engines.

On July 20, 2021, the company successfully completed its first crewed mission, Blue Origin NS-16, into space using its New Shepard launch vehicle. The flight was approximately 10 minutes and crossed the Kármán line. New Shepard performed six crewed flights between July 2021 and August 2022, taking a mix of sponsored celebrities such as Wally Funk, William Shatner as well as paying customers. New Shepard ticket sales brought in $50 million through June 2022. On July 20, 2021, the New Shepard performed its first crewed mission into space. The flight lasted approximately 10 minutes and crossed the Kármán line. The passengers were Jeff Bezos, his brother Mark Bezos, Wally Funk, and Oliver Daemen, after the unnamed auction winner (later revealed to have been Justin Sun) dropped out due to a scheduling conflict. The second and third crewed missions of New Shepard took place in October and December 2021. The Fourth crewed flight happened in March 2022. On June 4, 2022, New Shepard completed its fifth crewed mission launch and the sixth crewed flight took place on August 4, 2022. In September 2022, an uncrewed mission of the New Shepard had an anomaly due to a failure of the BE-3 main engine. The launch escape system triggered and the capsule landed safely. The remaining New Shepard launch vehicles were grounded pending an FAA investigation into the incident. After a six-month investigation, Blue Origin pinpointed the cause of the anomaly as a thermal-structure failure of the BE-3 engine nozzle which caused a thrust misalignment that triggered the capsule's emergency escape system to activate.

Blue Origin's headquarters is in Kent, Washington.