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| Overmaster | |
| Continuity: | DC Universe |
| Notability: | Antagonist |
| Type: | Cosmic being |
| Gender: | Male |
| Location: | The Cadre |
| Status: | Deceased |
| First: | Justice League of America #233 |
| Final: | Justice League International #66 |
The Overmaster is a fictional cosmic being and a recurring antagonist featured in comic books published by DC Comics. He is associated with the Justice League of America titles and first appeared in Justice League of America #233 in December, 1984.