Celestial Being (ソレスタルビーイング Soresutarubīingu?) is a paramilitary organization founded by GN technology pioneer and scientist, Aeolia Schenberg, approximately 200 years ago before the storyline of Mobile Suit Gundam 00 under the ideology of ending global conflict using a line of revolutionary mobile weapons known as 'Gundams'. In his lifetime, Aeolia Schenberg gathered and developed the resources needed to realize his vision, central to which is the creation and use of five fully functional GN Drives.

Celestial Being is a private paramilitary force founded by the scientist Aeolia Schenberg. It pursues the complete eradication of armed conflict mainly through the deployment of the revolutionary Gundam units, as well as other mobile weapons, in aggressive, sometimes indiscriminate military intervention. It acts upon the advisory of the artificial intelligence Veda, and its preferred mode of operation resembles guerrilla or maneuver warfare. As of the initiation of its publicly visible activities in 2307, Schenberg appeared in a taped worldwide broadcast announcing the organization's existence and intentions. Many people of Earth began a love/hate-like relation with Celestial Being, though mostly everyone does not desire war. Some people, like Marina Ismail of Azadistan, believe that they create only more conflict by intervening.

In addition to the small core group of Gundam pilots known as "Gundam Meisters" and crew of the Gundams' carrier ship, Celestial Being is very influential in all parts of the world and possess an apparently large number of personnel loyal to it. These personnel have different roles, including: engineers, scientists, intelligence agents, "observers" who function as a sort of guiding committee, financial backers, and many others. The group has received mixed levels of opposition. Civilian protest groups have held rallies against them, the world governments have attempted to stop them through military force and terrorist groups have threatened random, indiscriminate attacks until the group ceases operations. Although their public objective is the eradication of warfare, many people (including the organization's own operatives) speculate if the group has a different true objective, especially since the appearance of "Team Trinity" and murder of Union Professor Ralph Eifman.

As the events of A.D. 2307 unfolded, Celestial Being has been suffering from internal conflicts since the appearance of the "Team Trinity" and with Veda suspiciously hacked. The latter was proven to be true when inferior copies of the Gundams' unique power source - the GN Drive - are handed over to the world governments by an unknown benefactor from inside Celestial Being. Because of such developments, the primary Gundam Meisters rejected the Throne Meisters and took measures against them without Veda's knowledge. The events of 2307-08 would reach a climax when the world powers soon united against Celestial Being under the United Nations and barely defeated the group during Operation Fallen Angels.

Although Celestial Being had lost many of their mobile units and pilots, the organization rebuilt itself over five years, only to reappear with the goal of taking down the "peacekeeping force" known as A-Laws in A.D. 2312. As the conflict between A-Laws and Celestial Being escalated, Celestial Being became aware of who it was that betrayed the group in 2307 and that this same group - The Innovators - was secretly controlling the Federation. As such, Celestial Being turned its attention towards defeating the Innovators instead. This campaign would culminate in a climatic battle at Lagrange 2 where A-Laws was decisively defeated, Celestial Being took back Veda, and although the cost was high as the Gundam was damaged in the battle, Celestial Being finally defeated the Innovators. Following this victory, the group goes underground again to rebuild itself to prepare for the next time when they would be needed.

With a pacifist Earth Sphere Federation government in power, Celestial Being stayed in the shadows, observing the peaceful world. Due to the death of CB's financier Wang Liu Mei, the organization was forced to recycle and extensively modify their previous mobile units. Even more problematic was the fact that 3 original GN Drives were lost in the battle against the Innovators. On the bright side, Gundam Meister Tieria Erde, an Innovade, was able to link his consciousness to Veda and Setsuna F. Seiei had evolved into the first true Innovator. After a 2 year expedition by Linda Vashti to Jupiter, all that was needed was to wait for the third step of Aeolia Schenberg's plan: to gradually move an evolved humanity whose people could understand each other into the depths of outer space. There, the plan called for humanity to be fully prepared for communications with alien life. In the year A.D. 2314, a strange entity had moved into the Solar System. Due to the Trans-Am Burst System, more humans on Earth were evolving into Innovators, and strange events started happening to these people. It was confirmed that alien life had arrived in the form of the Extraterrestrial Living-metal Shape-shifters, or ELS. With few resources at their disposal, Celestial Being joined forces with the Earth Sphere Federation Army to combat the ELS threat. However, the ELS forces grew exponentially over a few months and were poised to assimilate Earth. However, Setsuna F. Seiei, through the GNT-0000 00 Qan[T] and the Quantum System, had made contact with the ELS and was later able to reach understanding with them. With this act, the conflict between the two species ended and Celestial Being's ultimate mission was presumably complete.

By A.D. 2364, it is unknown what has happened to Celestial Being, or its members. It is speculated that the group disbanded and granted the ESF use of the GN Drive.