Oriana was a planet in the Alpha or the Beta Quadrant. It was the homeworld of the Orianians.

The Orianians were divided into three mutually hostile factions: the Venturi, the Torlick, and the Green. Some time in the 22nd century, the Venturies and Torlicks began a destructive war that lasted for two centuries. By the mid-24th century, this war had left the world devastated and badly polluted, with little remaining surface vegetation, a barely breathable atmosphere, and the Orianian people sickly and slowly dying out (TNG novel: Nightshade).

It had some links with Orions. In 2359, after Orion pirates attacked the USS Starbound, Starfleet Commander Darryl Adin was accused of colluding with them, in exchange for a large payment to numbered bank accounts on Oriana. (TNG novel: Survivors)

By the late 2360s, the Venturies and Torlicks began peace negotiation and the USS Enterprise-D was sent to assist. Captain Jean-Luc Picard, Lieutenant Worf and Lieutenant Commander Deanna Troi visited Oriana, and became caught up in conflicts there. Finally, with all three sides dedicated to the peace process and restoring their world, Oriana awaited a permanent Federation advisor. (TNG novel: Nightshade)

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