| John Gabalas | |
|---|---|
| Lord of Rhodes, megas doux of the Empire of Nicaea | |
 Coin of John Gabalas | |
| Rule | ca. 1240 – 1248 |
| Predecessor | Leo Gabalas |
| Successor | Nicaean annexation |
John Gabalas (Greek: Ἰωάννης Γαβαλᾶς) was a Byzantine Greek magnate and hereditary ruler of the island of Rhodes in the 1240s. He lost control of the island to the Republic of Genoa in 1248, and called for aid from his suzerain, the Empire of Nicaea. Nicaean troops retook the island, but it was not restored to John's control, becoming a Nicaean province.