The Orelious system was a star system consisting of at least nine planets, one of which, Orelious IX, was destroyed in the Battle of Orelious IX, the decisive conflict between the Promellians and the Menthars in the 14th century, which led to their extinction. (TNG: "Booby Trap")

• Orelious I
• Orelious II
• Orelious III
• Orelious IV
• Orelious V
• Orelious VI
• Orelious VII
• Orelious VIII
• Orelious IX