Halbegardia was a state on the planet Adumar. Its borders were near Cartann.

When the perator of Cartann formed a world government without the other nations consent, Halbegardia along with the Yedagon Confederacy refused to submit to Cartann's rule. The perator then declared them to be outside Cartann's protection and a target of pacification.

It joined the coalition against Cartann during the Adumari Civil War. Elite Halbegardian soldiers led by Cheriss ke Hanadi stormed the perator's palace and managed to capture the perator along with his cabinet and retinues. Halbegardia eventually joined the Adumari Union.