Aldebaran Magnus V was a planet located somewhere in the galaxy's Alpha or Beta Quadrants, the fifth planet in orbit of the Aldebaran Magnus star system, in or near the space of the Federation.

Prior to the year 2267, Aldebaran Magnus was one of many planets whose inhabitants were wiped out by neural parasites. Unfortunately, parasites made it off planet and were able to infect Ingraham B and Deneva. (TOS - Star Trek 2 novelization: Operation -- Annihilate!)