The Halkan Council was a government entity of the Halkan species in the 23rd century. The council had the authority to conduct diplomacy and make trade agreements with foreign powers.
The Council spokesman in 2267 was Tharn, who informed Captain James T. Kirk that the Federation's request to mine Halkan dilithium sources had been denied.
In the mirror universe, the Halkan Council had the same legal powers and jurisdictions, but were willing to die to keep the Terran Empire from mining the dilithium sources from their planet. It was likewise led by Template:MU. (TOS: "Mirror, Mirror")