The Cardassian Supreme Tribunal was the highest court of justice in the Cardassian Union. It was presided over by the Chief Archon.
Tekeny Ghemor gave Kira Nerys information about the Supreme Tribunal during his shri-tal in 2373. (DS9: "Ties of Blood and Water")
In a cut line, Ghemor revealed the Chief Archon had tried to resist the Dominion takeover of Cardassia.