The Alpha Centauri Concordium of Planets was a metagovernmental body in the Alpha Centauri system, founded in the year 2020 to unify the Centaurii races. In 2071, the human colony of Alpha Centauri II was admitted to the Concordium. The Concordium was a member of the United Federation of Planets, and was sometimes referred to simply as the Centauri Concord. (Star Fleet Technical Manual, Star Trek: Pendragon)
The full members of the Concordium are:
- Velestus Commonwealth (Alpha Centauri IV/Centaurus)
- Al Rigil Union (Alpha Centauri VII)
- Kolmyri Colonial State (Alpha Centauri III)
- Colony of Alpha Centauri B II
The smaller colonies in the Alpha Centauri system are represented in the Concordium by the delegations from their parent worlds.