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| The Phantom King | |
| Aliases: | Xa-Du [1] Doctor Xadu Phantom King |
| Continuity: | DC Universe |
| Notability: | Antagonist |
| Type: | Antagonist |
| Gender: | Male |
| Race: | Kryptonian |
| Location: | Phantom Zone |
| Associations: | Phantom Zoners |
| Status: | Excised from continuity |
Doctor Xadu is a fictional scientist and an alien criminal featured in comic books published by DC Comics. He is associated with the Superman line of comic titles and appeared in books published during DC's Silver Age, Earth-One era of continuity. The character has since been re-imagined for the Post-Flashpoint "New 52" continuity, under the spelling of Xa-Du.