Kelfour VI was the inhabited sixth planet in the Kelfour system. This system was located in the Beta Quadrant.

During the Federation-Klingon War, on stardate 4789.6, a fleet of Klingon warships launched hypothermic charges at the planet. The subsequent explosions burned the atmosphere, resulting in the instant death of 11,000 civilians. (DIS: "The War Without, The War Within")

Kelfour was located in the Beta Quadrant on a star chart seen in the Star Trek: Picard episode "Maps and Legends".
According to the revised edition of the Stellar Cartography: The Starfleet Reference Library ("History of the United Federation of Planets"), the Kelfour system was located in the Beta Quadrant.
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