The Union of Cuprien was a Cuprien human state on Litchy, Netache, Bao-Mou.

It was founded after the collapse of the Grand Empire by Darina Tsempre, in an aim of uniting formerly and culturally "Cuprien" nations together into one, more coherent state, compared to its predecessor. Central control weakened with Darina's aging, with autonomous organisations like the Northern Fleet emerging. The Union continued to drift with the rise of national royalism and its totalitarian leader.

The state joined the State of Humanity and was completely dissolved, though to a large part its national institutions were directly carried over and broadened to the new territories. The merger mostly resulted in the powerful but legally restricted lesser organisations becoming free to form autonomous sub-states.