The Bolian sector was a region of space in the Alpha Quadrant, where the Bolian homeworld, Bolarus IX, was located.

Riley Frazier told Chakotay that she had been on a starship in this sector, when her ship had been attacked by an unknown species, which then put the crew into stasis and transported them to the Delta Quadrant. However, in fact Frazier had been assimilated at the Battle of Wolf 359, but she didn't want Chakotay to know she had been a Borg. (VOY: "Unity")

In the Species 8472 recreation of Earth, on Terrasphere 8, Admiral Bullock assigned the new officers Young and Reiskin to Orbital Flight Control where they would be monitoring incoming vessels from the Bolian sector. (VOY: "In the Flesh")

According to the Star Trek: Star Charts (p. 66), this sector was named the Bolarus sector. It was located in the Beta Quadrant. A portion of the Romulan Neutral Zone passed through this sector. A network of outposts, codenamed Tango, were located in this sector. These outposts monitored the Neutral Zone.
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