| Constantine Laskaris Κωνσταντίνος Λάσκαρις | |
|---|---|
| Emperor and Autocrat of the Romans | |
 | |
| Emperor of Nicaea (?) Claimant Byzantine Emperor | |
| Reign | 1204–1205 |
| Predecessor | Alexios V Doukas (Byzantine Emperor) |
| Successor | Theodore I Laskaris |
| Born | 1170 Constantinople (now Istanbul, Turkey) |
| Died | 1205 |
| House | Laskaris |
| Father | Manuel Laskaris |
| Mother | Ioanna Karatzaina |
Constantine Laskaris (Greek: Κωνσταντίνος Λάσκαρις) may have been Byzantine Emperor for a few months from 1204 to early 1205. He is sometimes called "Constantine XI", a numeral now usually reserved for Constantine Palaiologos.