Chancellor is a title used by some planets for the head of government. Planets lead by chancellors include Andoria, Malcor III, Ka'al, and Qo'noS. (ENT: "The Aenar"; TNG: "First Contact"; Star Trek VI: The Undiscovered Country)

From 2379 to 2382, Ar'kon was the chancellor of the So'ja Coalition, whose capital is located on the planet of Ka'al. (Star Trek: Pioneer: "The Removal, Part 2", "Torment and Woe")

See also: Klingon chancellor