The Triannon vessel was a type of starship class used by the Triannon people in the mid-22nd century.

In 2153, Enterprise (NX-01) came to the aid of a Triannon vessel that appeared to have been disabled by the spatial anomalies present in the Delphic Expanse. In reality, the crew had faked their distress in order to capture the Earth ship which they intended to use to end a religious war on their home planet. They were eventually thwarted by the crew of Enterprise. (ENT: "Chosen Realm")