An Emperor is a monarch who rules or reigns over an empire.
The term may also refer to:
- Hadrian II, a character from "King of Kings, Ruling over Rulers", who reigns over the wizarding Roman Empire.
- The Sith Emperor, a character from "The Hidden Empire" who rules over the Sith Empire.
- Harrison Hord, a character from "The Hidden Empire" who serves as the Emperor of Japrael and later as the Galactic Emperor.