|This article is about the Forge World; for the Primaris Space Marine, see Alpha Primus (Space Marine).|
Alpha Primus is a Forge World in the Quintillus System which is located just outside Segmentum Solar. During the Horus Heresy, it became one of the many worlds fought over by the armies of the Imperium and Horus.
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The Forge World declared early on for Horus during the Heresy, but it was brought back to the Imperium's control by a contingent of the Imperial Fists Space Marine Legion, that were stationed on a nearby recruitment world. When Horus' forces later arrived en mass in the the system, Alpha Primus was labeled a priority target for them; due to the fact that the Forge World specialized in creating Titan armaments and the equipment that allowed them to create their void shields. Like all the worlds in the Qunitillus System, Alpha Primus' final fate is unknown.