The Pahvo system was an inhabited planetary system. The Pahvan homeworld of Pahvo was located in this system.

The system was in the vicinity of Castor, Risa, and the Briar Patch.

In late 2256, the Battle at Pahvo, a pivotal battle in the Federation-Klingon War, was fought in this system. (DIS: "Into the Forest I Go")

According to the revised edition of the Stellar Cartography: The Starfleet Reference Library ("History of the United Federation of Planets"), the Pahvo system was located in the Beta Quadrant.
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