Neo Zeon is a term given to three separate armed organizations involving forces from the old Principality of Zeon. These organizations were established at three different times in the Universal Century continuity, once just after the defeat of the Titans, another formed four years after the defeat of the first Neo Zeon movement and three years after the second Neo Zeon movement.

In U.C. 0093, Zeon Zum Deikun's son, Casval Rem Deikun, created a second Neo Zeon known as the "Newborn Neo Zeon. This movement was founded under the ceremonial goal of "speeding up" the space migration of all of humanity, so the theoretical evolution of humanity into Newtypes could be realized. Char's plan involved a series of massive asteroid drops against the Earth, ultimately leading to an eternal nuclear winter, rendering the planet uninhabitable. The final collision attempt was to involve the Axis asteroid, headquarters of the previous Neo Zeon movement. The plan was ultimately foiled by the Federation's Londo Bell taskforce, headed by Bright Noa, and Char's old adversary from the One Year War, Amuro Ray. Both Amuro and Char were lost at the end of the conflict.