The Cardassian Eighth Order was one of the orders in the Cardassian Guard.
In 2362, Jagul Hanno was the commander of the Eighth Order prior to being relieved after the Setlik III Massacre. (ST novella: The Slow Knife)
In 2371, Gul Benil was an officer in the Eight Order when he was ordered to stop all vessels crossing the Cardassian border due to increased activity by the Maquis. (DS9 episode: "Second Skin")