In planetary classification, a class 9 gas giant planet is the Human designation for a gas giant which is recognized as a Q'tahL class gas giant among Klingons. There are no class 9 gas giants in the Sol system.

The IKS Somraw, a Klingon raptor, became disabled in a class 9 gas giant following an attack by a Xarantine vessel in 2151. (ENT: "Sleeping Dogs")