Holy War is a science fiction board wargame published by Metagaming Concepts in 1979 in which two groups battle each other inside a pocket universe.

An immense space-dwelling creature was able to seal a cosmic anomaly inside its nebulous form, creating a pocket universe in which intelligent life inadvertently developed.

"[4] In Issue 27 of Simulacrum, Brian Train noted, "the combination of many unit types and the weird board can render play rather confusing.

[1] In Issue 35 of Warning Order, Matt Irsik commented, "The game, while complex for its size, did a good job of portraying 3D strategic movement.

Irsik concluded, "The game had a novel concept, interesting forces, and the unique movement/combat gave it a great sci-fi feel.