The Gah'lir are fictional characters in the science fiction television series Galaxy Babylon. Throughout Season One to Three they are the main antagonists in the series.
The first appeared in the episode Crucible through the Keinerman Portal and confronted Robert Jennings and Gar'ann. They were lead by the Field Marshal In'rae. The Babylon Team learn that the Gah'lir were apparently betrayed by the Xan'arkin, but they were the betrayers as it is revealed in Betrayal. They then begin to wage war with humanity and the Xan'arkin and the Babylon Team work against them. The Gah'lir were defeated in the Season Three episode Wormhole.