The Galendus Cluster was a region of space, a star cluster located in Sector 275, somewhere in the galaxy's Alpha or Beta Quadrants.
History and specifics[]
In the mid-22nd century, Bryce Shumar, then serving on board a science vessel, used Alonis Cobaryn's star charts of the sector to navigate the Galendus Cluster. (ST novel: Starfleet: Year One)