GP5 From Wikipedia the free encyclopedia GP5 could refer to several things: GP5 (gene) T7 phage, or Gp5 GP5 chip, computer chip GP-5 gas mask, Soviet civilian gas mask Topics referred to by the same termThis disambiguation page lists articles associated with the same title formed as a letter–number combination.If an internal link led you here, you may wish to change the link to point directly to the intended article.