| Ilbasan Persian: {{script|Arab|ایرزن | |
| Succession: | Khan of the Golden Horde Eastern Half (White Horde) |
| Reign1: | 1320/1321-1344/1345 |
| Predecessor1: | Sasibuqa |
| Successor1: | chimtay |
| House: | Borjigin |
| House-Type: | Dynasty |
| Death Date: | 1344/1345 |
| Religion: | Islam |
Ilbasan or Erzen (Ерзен хан) was the ruler of White Horde from 1320/21 to 1344/45. During his reign, an increase in the cities, trade, and craft occurred in the Horde. After determining the boundaries of his Horde, Ilbasan appointed his deputies. Islam was used as an instrument to strengthen authority.
He died in 1344/1345.[1]