Not to be confused with:
- Imperium (Power/Thrash Metal from Tucson, Arizona)
- Imperium (Black/Doom Metal from Los Angeles, California)
- Imperium (Melodic Death/Thrash Metal from Santa Cruz, California)
- Imperium (Metal from San Diego, California w/ Phil Mitotes)
- Imperivm (Black Metal from Idaho)
- Imperium (Death/Thrash Metal from Sidney Center, New York)
- Imperium (Power/Thrash Metal from Tucson, Arizona)
- Imperium (Black/Doom Metal from Los Angeles, California)
- Imperium (Melodic Death/Thrash Metal from Santa Cruz, California)
- Imperium (Metal from San Diego, California w/ Phil Mitotes)
- Imperivm (Black Metal from Idaho)
- Imperium (Death/Thrash Metal from Sidney Center, New York)