Sector Four was a sector of space located in or near the Orion Colonies, in the Alpha or the Beta Quadrant. It contained the Vola system, and the Orion Colony of Vola V.

Following the Four Years War between the United Federation of Planets and the Klingon Empire, and the subsequent foundation of the Orion Neutrality Area in reference stardate 1/9806.29 (c. mid-2250s), the Federation's Rigel Demilitarized Zone Commission resettled a number of Orion refugees from Sector Four, including Vola V, on the world of Tini, itself an Orion Colony. They failed to readjust to the harsh conditions and soon migrated elsewhere; only those from Vola V stayed. (FASA RPG module: The Orions: Book of Common Knowledge)

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